Malicious PDF — malware analysis report

Static analysis result for SHA-256 693785dad96a5b59…

MALICIOUS

PDF

76.0 KB Created: 2021-06-04 12:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d18d52c3a37cb893894d4761b97e963a SHA-1: 201ea09ebb8c89ea70c1899614e3ae65e9c7cb1c SHA-256: 693785dad96a5b59fd30ff6940da9cdd0c903a70e61cb5e300b5cf3dd4d15dbf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=horatio+alger+success+story PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fc65e6a03cf8.pdfIn PDF document text
    • https://jedujubopo.weebly.com/uploads/1/3/4/5/134521244/216953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_604ec2cc7cea7.pdfIn PDF document text
    • https://fozujivopaj.weebly.com/uploads/1/3/5/3/135303700/daseveboxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421215/normal_5feb8cc9769a3.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/tewejetanu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5ff9f490ecccc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivupored.pbworks.com/w/file/fetch/144485652/43968891755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d07f19b-b93d-4bd1-8c36-c620f9691fca/the_norton_anthology_of_world_literature_volume_f_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a63068-1080-4ed1-aa60-b14eb6a65393/goxowidikatapagulareguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab874b6e-f4e6-42ba-b58e-6d6c9f4d49f8/donimutitapelaxivonanama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291b8e3f-1320-4272-8bc0-7cc2eb465db0/chamberlain_clicker_universal_keyless_entry_programming_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0464bd9b-66bd-4d61-957b-68c9eae0e030/jeppesen_airway_manual_introduction.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/wowaxa.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/can_i_use_wireless_mouse_receiver_as_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b933fca0-4245-4bdf-aa12-ddefb60ebdce/is_there_an_app_to_translate_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09dece49-7ab6-4aec-8c2d-26ff260b07d8/manual_for_sony_dream_machine_icf-c218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddaf42f-46be-4010-9172-ded2ecdcff14/zoxitore.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/how_to_replace_a_whirlpool_washing_machine_timer.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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 5028 bytes
SHA-256: 8b4c58e937ff6fdffb140dad783e011953071d8389379ec67841c268ea76a431
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 11312 bytes
SHA-256: b5242a4937bfc597ef24cf8b60f722eeaeea292b7f583fb60f11434e54db0086