Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be1de6cc80c1c64…

MALICIOUS

PDF

69.0 KB Created: 2021-02-12 02:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3be21d17aff17e15fda9ec471906acf4 SHA-1: d94197ccf83e135016fa2124ee67687157b4b2f9 SHA-256: 1be1de6cc80c1c640a3337cc7e27aac0a3416959b157752e7fd8e9e549ed6685
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the sheer volume of outbound links suggests a mechanism for redirecting users to potentially harmful content or further stages of an attack.

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://crophysi.ru/123?utm_term=socrates+to+sartre+and+beyond+pdf PDF link annotation
    • http://apparentlyopt.com/audio_booster_android_root68mqy.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/LkifUji/metal_gear_solid_alert_ringtone_iphone.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/d4e67cd4e3f247.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/rhdgige/nuvaritiv.pdfIn PDF document text
    • http://jawefaxonokej.iblogger.org/bulokiriwidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5ffecfcf5a336.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/7986958.pdfIn PDF document text
    • http://power-guard.shop/nogekodefamezenipurzpdcl.pdfIn PDF document text
    • http://ttttrrrr.space/858011807583a29y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5fd7c2718d3fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ffd2ab6e2595.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/gie4Uji/56476188146.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/bvXhbjc/92611135571.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/8227817.pdfIn PDF document text
    • https://bogexisamalalu.weebly.com/uploads/1/3/5/3/135320210/rufis_mizuvagejoxed.pdfIn PDF document text
    • https://cdn.sqhk.co/xupixawina/gihjgPF/3205784557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinejamuwaki.epizy.com/7857003183.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_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 5460 bytes
SHA-256: cb12f1a2b43d7dd24ac3a588b22436737499c30aea3a88a03d095fdb45109b0c
font_01_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 10776 bytes
SHA-256: 3051acbfa3b7586f413cb61ebb2fbd93b329b506aac1702b74d66a3bda164b4b

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