Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab4686ac70912e9…

MALICIOUS

PDF

78.3 KB Created: 2021-05-24 23:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b74fe32204680e608e6d9ff7212d4cb SHA-1: 04e2a3217b24b88d5436d35b8c73d8f617deeb12 SHA-256: cab4686ac70912e9090b80d9bcfcb9031c5eedf803a95c1a9f95d39c270d5b45
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs and the ClamAV detection indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to redirect users to malicious sites.

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
  • 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://ponafet.ru/strik?utm_term=summary+writing+exercises+with+answers+pdf+grade+7 PDF link annotation
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/mamozilisaz_bejeneridov.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/wifurixasubefoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fefe1662cd65.pdfIn PDF document text
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/rikubaxulud-wulodokulekume-sumuxagado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443595/normal_6006e2891c249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fed0d197f26a.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/jakutazamazudaju.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/neguwobodef-vinejadimesi-xukoniwimu-ramakedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6018ed3f56f2d.pdfIn PDF document text
    • https://pepukuvem.weebly.com/uploads/1/3/0/9/130969690/3d7c18018126097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_602c070627c32.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/4456689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_60538b98ee5e9.pdfIn PDF document text
    • https://pisilobeko.weebly.com/uploads/1/3/4/7/134728547/wadofugamuvanem_jiwuf_kejubule_kedolotesov.pdfIn PDF document text
    • https://tipiwaterexiw.weebly.com/uploads/1/3/3/9/133997214/398050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6067976f96347.pdfIn PDF document text
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/48f6845a305.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/rugufebinevolozamodo.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/dba46ba7-fbf0-48cd-adf7-4c3ec0fbe858/what_are_the_top_10_girl_names_for_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658fc0d3-8e34-4e28-930a-0ce9215443d1/navy_protocol_officer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f755d2-267f-4143-ba2e-d4c6ef2b50b4/vifofitaxepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc925b7-dfa1-4d72-8a6a-cf324d03af97/what_oil_does_a_honda_2000_generator_take.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_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 5984 bytes
SHA-256: a1dd8870c57ed2b808f9128b893a28588d2e3a48f36c6f04b0f8e40bdc500862
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 10420 bytes
SHA-256: a521e909e6efe677ee67e85566ff7287d4ad92c47e9cb0d162802a4ef88122ab