Malicious PDF — malware analysis report

Static analysis result for SHA-256 440fa5cfc50eb1c4…

MALICIOUS

PDF

95.4 KB Created: 2021-01-18 03:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 087f2c827318f63fedbaf8c670d20e68 SHA-1: 4e8b3ddab511a08e935259d02a37465e4f4d2105 SHA-256: 440fa5cfc50eb1c404fe34aad8e8f05a1412538217f6f98fbdcfca053b6ad629
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing a significant number of external URIs pointing to potentially malicious domains. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the structure and numerous external links strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://traffset.ru/123?utm_term=del+taco+nutrition+information PDF link annotation
    • https://cdn.sqhk.co/xederebat/giigjha/22699065367.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/gftRZJo/kupozir.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/dgjfijR/basketball_throw_technique.pdfIn PDF document text
    • https://site-1173607.mozfiles.com/files/1173607/le_mtabolisme_basal.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/t6hgjbi/85813272213.pdfIn PDF document text
    • http://selizixid.iblogger.org/putop.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/df174c08121ad0.pdfIn PDF document text
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/1040073.pdfIn PDF document text
    • https://site-1173426.mozfiles.com/files/1173426/4002057898.pdfIn PDF document text
    • http://jitokinut.iblogger.org/converse_plataforma_mujer_corte_ingles.pdfIn PDF document text
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/widasevubudi.pdfIn PDF document text
    • https://cdn.sqhk.co/gizulakofo/buhHkgj/dining_room_wall_decor_ideas_farmhouse.pdfIn PDF document text
    • https://site-1251254.mozfiles.com/files/1251254/birthday_gif_videos_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wewimolu.epizy.com/albatraoz_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/baroness_arbutin_mask_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/facebook_all_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/advanced_english_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/370198102.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/functionalist_sociology.pdfIn PDF document text
    • http://zunebodiz.epizy.com/tefen.pdfIn PDF document text
    • http://lafeseg.rf.gd/9360953573.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012f29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F29 27596 bytes
SHA-256: 476bbffadb99112fba9aba8e489bba9076e9d513af4ae9ad8f717a989750e0e2
font_00_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 4728 bytes
SHA-256: fe3369f0629a53c41b59a132e36be693ee39f0aadbc71a624ce2cfb461d55b9a
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 11880 bytes
SHA-256: 26f3157dce1fd91bdad024b727e9c28b22b5f4ba1d631247f6cbc95b5ebc051c
font_03_sfnt_off00016150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16150 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c