Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de4447480385a0…

MALICIOUS

PDF

87.4 KB Created: 2021-03-13 19:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 191a03a4f514779771ab3091eee9fa80 SHA-1: 59d676190775f82655f92be5f8c7288f91e9f172 SHA-256: 91de4447480385a0514a6f5007080f7f658217b6dd84bb4f0d1f98a91f1729bb
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identifies a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=ignou+b.+ed+form+2019-+20 In PDF document text
    • http://degunoneb.iblogger.org/serunogatuturapedesuvofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_603618d92ddb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_601bfdf590d86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zisekajoreva.epizy.com/cricinfo_app_apk.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_85967a389727450d8e626913b00ca3c3.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_754dbb4a4002431dab4d4d7b97703a2d.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_d4243ece49a4491aae65ac35fe1b8f57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58109911-72c4-4c56-988b-63279870c06f/timex_ironman_battery_replacement_reset.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_7a6eed78ce0c4e3ea1ce2bb1679ec4d7.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_f8b829d5ac18433a86f4173bce86e976.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_706fcd1888aa40a4b46659af01132de3.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_dafba9d1303c4bdca5b51fc2cc543fed.pdf?index=trueIn PDF document text
    • http://regeliz.rf.gd/2012_hyundai_sonata_hybrid_repair_manual.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_3464398267e04ac6841bcf93abedd3c1.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_994318b7c120430ab57cc6daabc36caf.pdf?index=trueIn PDF document text
    • http://wasamatebupo.rf.gd/ccleaner_pro_apk_full_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce7e0f1-6680-4659-9818-c020d0d60f1d/will_universal_remote_work_with_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7afac4b-9020-495b-bb14-e8e433b22aaf/guerra_carlista_valle_inclan.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/nikiriz.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/93826385800.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/98588426078.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 5184 bytes
SHA-256: 7e4ee818415a87ba3f63dfb454857c920d5f8053bbb9fd18309e326f5368ddaa
font_01_sfnt_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 11092 bytes
SHA-256: fc9055aa1894bf5d42ef879cb5a3692fad2383990b449fc913ca5a2a293027e6
font_02_sfnt_off000141e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c