Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd5cf41ac0849bb…

MALICIOUS

PDF

83.5 KB Created: 2021-03-30 07:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc5f716e9a343e7e1017682c507ecc6a SHA-1: bd89bc73ead04794092736147f410bae3cdec7b0 SHA-256: ebd5cf41ac0849bb00e64e930423922277200c125b551527da7ddef7efd53f12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=sample+application+form+for+job+vacancy PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/hdhfVlC/78892282783.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/7916569867cveeb.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/1eb62ca68845.pdfIn PDF document text
    • https://vokesilito.weebly.com/uploads/1/3/4/4/134400786/4387212.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/cihgfhg/color_absorbing_sheets.pdfIn PDF document text
    • http://biomaniks.website/future_perfect_vs_future_simple_exercises78n74.pdfIn PDF document text
    • http://fodadasome.iblogger.org/38821725391.pdfIn PDF document text
    • http://questotzvezd.space/706095146336h76g.pdfIn PDF document text
    • http://disclosures.space/83094516468tm02r.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/IjaSXXm/vuwamunun.pdfIn PDF document text
    • http://pannochki-art.com/what_is_presonus_firewire_driver4oyzl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifujisebakiju.epizy.com/57652346241.pdfIn PDF document text
    • http://puzamurepedo.rf.gd/chava_kadambari_marathi_free_download.pdfIn PDF document text
    • http://vubeduwamop.epizy.com/15511286080.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/fumumijekosexomumo.pdfIn PDF document text
    • http://bibubojudij.rf.gd/6694927988.pdfIn PDF document text
    • http://xoxitazowakovit.rf.gd/28103146527.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_c43d08aa074f4028ba1ba6812d04b081.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_ad54c1c7ab6c4623a1b9d924805ee9b0.pdf?index=trueIn PDF document text
    • http://nakosaf.rf.gd/webakegupafobofuxomofezom.pdfIn PDF document text
    • http://sugajuze.epizy.com/linukivunolizotofi.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_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 5464 bytes
SHA-256: a198056f4829f0d25c3030e98cf26dbb4ed41f79a6341d2e6541c5485fb13b6e
font_01_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 11152 bytes
SHA-256: 495a9ce3b7c9242d68bb74ea4cc14e2efdfd8adcbe719a41057729e054c3bc11

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