Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9817b6ea1594887…

MALICIOUS

PDF

86.2 KB Created: 2021-05-24 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9fcb4d9eea8fdacea56ada3f5118d610 SHA-1: aa52f8d924bd955627289b727c2cbe8c9aa77fa2 SHA-256: b9817b6ea15948873648e11a0a859d701f110b3fdb3503d0ead0feee7b9eff44
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick the user into calling a phone number for a fake support or billing issue. While no scripts were explicitly extracted, the presence of numerous external links suggests a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=how+do+i+reset+my+kwikset+smartcode+916 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472501/normal_5fe6aef0bbf66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5fe77bb869334.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/0bbb57c6ace9967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489734/normal_5fed3f0867ee8.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/3271032.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/381aa75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_6040fa9006c38.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/pukosipavate-romosukakani-purosixo-madepibor.pdfIn PDF document text
    • https://zusonugen.weebly.com/uploads/1/3/5/3/135305237/vovev_tokejoworazu_sopajojejivana_rubesuwalirap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_5fda8e68ed575.pdfIn PDF document text
    • https://nakosedamewa.weebly.com/uploads/1/3/4/6/134612328/roneganade.pdfIn PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/a32a0fd6.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/9f4f4b435c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7daeb890-9f1c-4040-bfe2-0c2c93699e26/wogarixebidero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff431cc-6094-43fd-b7e4-d63c5ebc1934/what_is_driving_licence_document_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1518c6f2-423c-48cd-84c8-bad870b7c042/macmillan_mcgraw_hill_treasures_kindergarten_activity_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcf9c5c-1d8d-483d-8dec-944dc1028baf/sta_rite_pool_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19f3aa1-fc48-4a47-8fe5-8047bc26d86f/simapopizopinufojuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbd759c-a264-4682-a70f-a84f2c5d5f06/matewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e397d2d5-0568-4310-a17b-28d93ad1622d/magic_chef_gas_stove_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae485e85-6e96-41cc-acd6-19f1d2308f73/66348901556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4665594-f0c0-46a3-bb24-b7492f903ee1/the_crucible_a_play_in_four_acts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f929e8-7e75-4a43-b0e4-f1d1b5775f57/62368502717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a798ec76-9055-4ed4-a9c8-a9a3723f80cb/zuridi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/605ec638-4173-4c7b-9bc5-17e5e5af082c/migonobasujoxaledawiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84b5f5c-2978-4e0d-9924-ab4ceb0e0203/how_do_i_lookup_my_driving_record_in_minnesota.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 5636 bytes
SHA-256: 251ac11075e2c9d604d5dafc176b7b2519505c35bb0ee5df74e3b0d798ade43c
font_01_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 12132 bytes
SHA-256: c3ba19d58cb3ea667bc165af3e2ab3a0371ba53c53de048c5597a361caa759b2