Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56d59c2263dc786…

MALICIOUS

PDF

80.3 KB Created: 2021-06-06 13:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6a4c0ef78c09634303581202d08febe5 SHA-1: dae43efd121b27c2c5cf19e014de45a84a8a45b8 SHA-256: a56d59c2263dc78657d6607c21aee7f2f4a483534a4f1abe887098ca76664dec
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.007 JavaScript

This PDF document exhibits characteristics of a social engineering attack, specifically a 'ClickFix' variant. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The document's body, though heavily obfuscated, implies instructions to execute commands, a common tactic to bypass macro restrictions and directly initiate payload downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://allytemp.ru/pbw?utm_term=how+to+fix+faceit+anti+cheat+windows+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450046/normal_60bbfdfb3c27a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408186/normal_60b4c0daca8d7.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/72df4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_6010583d6aceb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_60026775c3255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_5fd76e9c6ed42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_5fd88129534cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_605c67c131b50.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/3b90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_602368cd3479d.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://jeselivid.pbworks.com/w/file/fetch/144499869/tirerezotaridusuruti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3183dc-5256-4a78-a5b8-68541ad86f75/pakewinafesojibadafoxozow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf5e5d4-2139-4ceb-b70d-cc93af4d2d81/74502991982.pdfIn PDF document text
    • http://jabodawo.pbworks.com/f/85386214833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64dea6d7-5cef-4851-852f-6653cd7b7a2a/kinotifunonavoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b63565f-9356-4e14-b25b-b12c0a38ed31/satebowofulerunewizumevux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96becb6-7050-4764-99b2-fbbc3e06738d/jeep_cherokee_problems_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d830963f-0c57-4af2-9c39-9635050c64fb/black_and_decker_string_trimmer_parts.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_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 5120 bytes
SHA-256: 76a65f9e393bd1a7b5a5c621f8894d0bd80e71e10df9bb4f09b77a5d6e2c047f
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 11924 bytes
SHA-256: 3695be567024ac9ce92f1218895ce1c23ae38cc24f0cc758eeffa9d37bcbe03d
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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