Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c0acb2bd1c200b…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 19:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b641fb637866e3a99cd4567f0cf5c7bb SHA-1: c8dcf1343ecccf62391b2d673d8bb7845587f15e SHA-256: 87c0acb2bd1c200b988ef17a62da6791bd9ba6f8ae923b583765d9194162f181
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to host or redirect to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=padi+open+water+book+pdf PDF link annotation
    • http://shopmzm.site/tojibosuparumakuwarebuqpbo.pdfIn PDF document text
    • http://ideaita.fun/international_kangaroo_mathematics_contest_20216xl1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_602146af99448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_600db949f3210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494661/normal_5ffa3ab66324d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_6034d45775f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_6014340362980.pdfIn PDF document text
    • http://strapslap.online/vefajipogobidakowekawufaf9gb4a.pdfIn PDF document text
    • http://momentikshop.space/196745314546nkwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fd173a9d75bb.pdfIn PDF document text
    • http://furogoverakafex.22web.org/ten_sport_live_streaming_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_601fe49ec07df.pdfIn PDF document text
    • http://verenica.net/kiradatatagoxowixopejemdn5mu.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
    • https://uploads.strikinglycdn.com/files/f34f313e-b06c-492b-b47a-44ccc3af1b2e/1198569433.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/68590663415.pdfIn PDF document text
    • http://radulamuwufudez.epizy.com/hitchhikers_guide_to_the_galaxy_quotes_marvin.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_b08b680bef5c455aa25fb422bf77ae42.pdf?index=trueIn PDF document text
    • http://keronujewewobo.rf.gd/domegugeridalu.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_120a36245a9a4c3b8cc4d51fbccd2c82.pdf?index=trueIn PDF document text
    • http://jubuzixabes.rf.gd/measuring_up_live_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c70cd9-ab31-42b0-955c-f8478a5746bc/tuwugusekamiwubaravipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c011c2-e8b8-497e-8c7f-b1e98c1bf290/pigman_summary_ch_6.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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 4912 bytes
SHA-256: 4ff5d1c755793a7920999750b2b08f3b3b976d3bfa2d503ad88cb5a0e473964c
font_01_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 13976 bytes
SHA-256: 1606edb0263f65d18217b5b41682d41c3ed6cc52dd99b6d0e6a46fe74c50fe75
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f