Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4fb8405c4e3a14…

MALICIOUS

PDF

87.2 KB Created: 2021-02-05 11:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b043dce41f55159848db471a856b2005 SHA-1: ce7188c8e0c195a67c2a65a497e984fa94514192 SHA-256: fa4fb8405c4e3a14789f9bc8c30c8906c7b9ea6322f2f27a8706959299151249
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF link farm containing numerous external links to PDF files, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the callback lure heuristic further support a phishing or scam-related attack pattern.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/aws?utm_term=dipped+products+plc+annual+report+2019 PDF link annotation
    • http://beweroxaku.66ghz.com/51368730817.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/Yxijmhi/tekusonewusa.pdfIn PDF document text
    • https://cdn.sqhk.co/retuwami/ibifagf/xemanijujobuteneretitukuk.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/8b0f1.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/sia6pgf/star_wars_live_wallpaper_iphone_8_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/GcjjheP/74049251228.pdfIn PDF document text
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/tutisepitifenarag.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/xatagobagijarib.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/dujcid4/spirit_runner_gallery_taos.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/0V2VieC/t_mobile_money_atm_withdrawal_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/fTggexH/5414511191.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/fgdMied/boris_and_the_dark_survival_mod_apk_revdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatojigetafugud.epizy.com/54784479523.pdfIn PDF document text
    • http://dogufisojorosef.epizy.com/importance_of_communication_channels.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_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 5548 bytes
SHA-256: 0de83548ad9ec95ec65a69fc3f7e1473093642283a8e68019b4e6a792f37775b
font_01_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 12092 bytes
SHA-256: 2e4feb2913916656af849dfd9c95f9f98a4ce34ce69fcdce50f3ca6aa0b98f0c

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