Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ad35d889716904…

MALICIOUS

PDF

75.8 KB Created: 2021-05-28 18:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 20faa286efe61ae13614bc46e2fdf05b SHA-1: dde347c3234c9644445e5332c186e237779780c1 SHA-256: c7ad35d8897169048e523ab0e7745d3cc5eef74381b71eac807e666b60b7fb10
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or SEO spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=types+of+pollution+for+project PDF link annotation
    • https://pezevibasa.weebly.com/uploads/1/3/5/3/135306661/2301241.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/2897918.pdfIn PDF document text
    • https://bisofojud.weebly.com/uploads/1/3/1/6/131607445/fodepimawafa_jonelelumafa_sufamus_gagobeduxonel.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/a8143b5e5d1d.pdfIn PDF document text
    • https://mukokoloraji.weebly.com/uploads/1/3/4/1/134131612/7846116.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/cf40b.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/2402904.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/310e750.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/a2ddedd1-c4f3-4120-bbdb-2029dea921f2/pathfinder_kingmaker_multiple_romance_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32c027c-02b6-4e75-ad99-36a575d2cf72/jirikupaworoxolelem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d292774d-4fb9-4600-8b59-23b9f0067080/how_long_does_it_take_to_get_a_driving_test_appointment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9afa9d1-c20a-4dd8-9754-b22d562ea34a/5220091300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734a427e-519c-4865-b80d-a898fab19edc/23245125751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186fe8a5-602e-4ea6-abc7-5847ff84b767/grammar_textbook_for_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f02fcc9-e005-4f6f-9a4d-dad0508c389f/yaesu_ft-450_manuale_in_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1300fc-d491-46d8-9b58-2fda1bab4d2e/navy_seal_requirements_asvab.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_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 4928 bytes
SHA-256: 3a49213a15512d4ff03d63398bd85d5da778facc1861f63bae1ce6178a2600bb
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10400 bytes
SHA-256: e7da9698be9c93b0901589f740847b3e7a34f3e0bdaf7a57f976d96dfd787b9a