Malicious PDF — malware analysis report

Static analysis result for SHA-256 83444f6a6520d5d1…

MALICIOUS

PDF

81.1 KB Created: 2021-03-22 09:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f2a2e55e779cf6cfa11397145116af5 SHA-1: 56addb2095b1d50aa416fd76f1924e0353e58300 SHA-256: 83444f6a6520d5d14d33f3f21aab2dfed6fdae7524d7f29f43be38dd86598796
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=transcendentalism+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406455/normal_602bfbe5676d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_601951819a96e.pdfIn PDF document text
    • http://generatorsale.ru/android_update_for_huawei_mate_752k87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fe52d8065d2e.pdfIn PDF document text
    • http://italywom.space/great_depression_timeline_worksheetjvvsk.pdfIn PDF document text
    • http://wekawuro.22web.org/jejibop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_60175d999492a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5ffa5581e17fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_600a08b1044de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_6024b52a12e4b.pdfIn PDF document text
    • http://visionnew.xyz/what_are_the_apa_ethics_codek0f0s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5fd622434e833.pdfIn PDF document text
    • http://btsworld.org/77380200556303n4.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://ruxuvejefo.epizy.com/mobakoribilevivodorizuju.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_600c6d97ff9842618cb30e202785bc45.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_98b446c5a876472d9920f11e88cd905a.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_a26c0adfcbf8476996fb73bea896cb44.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_30e2b938426c4300877f5c07cafc4f1b.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5080 bytes
SHA-256: 1445faa93e6bb2823717749919dd3352e890a1693eef71a8255e1b2466445dc7
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 11948 bytes
SHA-256: 7d0e5a9979726cc7491cb9fc42ae2b4fd394b438ba2769c77217fed754cf1197
font_02_sfnt_off0001295c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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