Malicious PDF — malware analysis report

Static analysis result for SHA-256 80541ca2042554e3…

MALICIOUS

PDF

86.3 KB Created: 2021-04-02 00:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73b1df7a862c902f8dde2fec9be5b6fb SHA-1: 1d3476afa7f418029cf1ba279f5ef1763e51135f SHA-256: 80541ca2042554e3bd513df9558c0a5dc4021637e1267e4cc8076fd45b185b98
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Tesco pet insurance claim form death'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/123?utm_term=tesco+pet+insurance+claim+form+death PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://fastpeysistem.online/375602017701v5it.pdfIn PDF document text
    • http://dkblogin-de.com/how_to_start_electronic_repair_shop86q15.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/ghjgghe/civ_5_no_expansions.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/gjdVgiP/86345982621.pdfIn PDF document text
    • http://badge-verification-center.com/how_to_use_igora_vibrance_clears7m6y.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/jf4icgc/38613976712.pdfIn PDF document text
    • http://vovality.club/58239382079p0jh.pdfIn PDF document text
    • http://smcjd.com/61118862984xxdji.pdfIn PDF document text
    • http://cabinetshq.xyz/nordictrack_c_970_pro_treadmill_pricekyq5s.pdfIn PDF document text
    • http://smartbright.club/55821637079wk0mx.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/cib2if5/xelaxojoniraluvisiber.pdfIn PDF document text
    • http://hookup671.site/campo_de_estudio_de_la_economia_politica3jg20.pdfIn PDF document text
    • https://cdn.sqhk.co/tejusukaxajo/ehigcgg/jivepejefuwivitakedanof.pdfIn PDF document text
    • http://vertitribe.store/best_custom_browning_hi_power6scbd.pdfIn PDF document text
    • http://bloodcraft.online/neural_network_projects_with_python_downloaddesuk.pdfIn PDF document text
    • http://rasprodavaika.ru/63154781549pnkvl.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/750a2e8e-a4f7-4753-bf91-65c70d3253cf/toro_lawn_mower_parts_20332.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/beats_studio_3_camo_sand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12bfea1-2667-464a-ad02-e3196c8ee079/nitisifunogeturexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cdd7ed5-a6a9-4a03-b4d0-396bc8f69525/will_colleges_reopen_in_january_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/sivigegeregofutexojo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 5344 bytes
SHA-256: 0250bae9f6b368041bf3344df3461a646bf4166b8fa121af8b502d93cc11cc70
font_01_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 11600 bytes
SHA-256: 31ce5b3b0a9095480e251e4accb56f60cfa532b48b7e2d3e91f1096d5048b6f8
font_02_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf