Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e3b835d9fb79e5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-26 18:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8bd0e4d2b1418c8d6a36ff5f2fd55fc0 SHA-1: 6ccefac87f01067dfa1ac2cc06893ddab141f5e5 SHA-256: b3e3b835d9fb79e506b6ac4db1963e662938e7e19e46b9ba73a423280775f73f
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content or download further payloads.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=basis+swaps+pdf PDF link annotation
    • http://insurancecarusa.com/how_to_replace_door_switch_on_kenmore_elite_he4_dryerfgio9.pdfIn PDF document text
    • http://shortsomfj.space/how_would_you_describe_a_treewd28d.pdfIn PDF document text
    • http://gutprod.xyz/learn_korean_language_online_free_downloadbb67y.pdfIn PDF document text
    • http://italonewsero.site/honeywell_rth230b_thermostat_owners_manualx6j36.pdfIn PDF document text
    • http://xumugawejal.scienceontheweb.net/natafatirelo.pdfIn PDF document text
    • http://grinallex.shop/i_too_sing_america_julia_alvarezfscsl.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/19955150748w3ufq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/86731508397.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/pixhawk_blheli_esc_calibration.pdfIn PDF document text
    • https://c945751c-610e-4f4b-8d8c-4431096f0ac5.filesusr.com/ugd/f34823_6a1b1e3d1bb747119eb809a58fc3c861.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_fb18bd1079e6444182854e3ccd6f96ca.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_c5cc2c62149d4c978798ab803e8cfa86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/5649720192.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_9bc26efb7fd649aaa69da66ea792aca7.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_fef2d589b8b14fbe9b53caab2e7ecdbe.pdf?index=trueIn 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_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 5048 bytes
SHA-256: c76bd8042a1467f0e83dd822e024d2e0a156980aca7818ece0b2a6b9e277f1cd
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 11136 bytes
SHA-256: 7243ef3d9bb7c118de8d69f94783a132fabb2f87eaceb20359b994929a9dec99

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