Malicious PDF — malware analysis report

Static analysis result for SHA-256 397b7ef589da5653…

MALICIOUS

PDF

76.2 KB Created: 2021-04-11 14:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 34491ea31c869f38d7124b99025eb51a SHA-1: 74bfac8caea50a447676c871be8c9366497640b7 SHA-256: 397b7ef589da5653880119d696cb0a3a9a42fb4d1aee8047d456022a8db9230e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the document's structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=samples+of+persuasive+essays+for+6th+grade PDF link annotation
    • http://instofficial.online/muvufazebevans7qf2.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/zarixodejoxidu_kelujawewepos_zupizamuropinib_bubidivokesek.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/who_first_used_guerrilla_warfare.pdfIn PDF document text
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/vetun.pdfIn PDF document text
    • https://gedarimetesuja.weebly.com/uploads/1/3/1/3/131398281/931b9d8e518b4d.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/868158.pdfIn PDF document text
    • http://gtomishebs.xyz/fish_bowl_bookendsrxa2g.pdfIn PDF document text
    • http://normab-id.com/25192436358fdmsm.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/ibm_aix_basic_commands.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7417845d-6d31-4fd7-9877-dea458dc58e9/likijopikogag.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/7419948050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d3aced-c119-41f8-a1d5-d81046ecdbd0/jalugakagotabatisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7beeb596-c260-4cf6-84fd-3af43c2a6b76/16128789522.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/7058296143.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/astrology_software_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1f8143-78d5-4f5b-adf7-8843b743653a/the_twilight_saga_new_moon_soundtrack_download_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/sony_dvp-cx995v_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/mijuwikodumelupifiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be01d5e1-8169-4f82-9e3e-77072dd788f5/silopupirujizib.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_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 5872 bytes
SHA-256: bbe3969551ee2038c0894f354c03c7166945e288d993e36d68cf7fbbec13a33c
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 11040 bytes
SHA-256: 90fad5ed3fbe3cd501e7798888726ea3f573ba93b6c22ae53ad6ea92d9adc3fd