Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2460cfbec8bb5fc…

MALICIOUS

PDF

86.3 KB Created: 2021-06-09 08:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: af7c180c7c889ace73f6fcfa4085e51e SHA-1: aa3a272c109e0b1476ae702d67811e5dc099dcc1 SHA-256: a2460cfbec8bb5fc42023cb1dfa78be4347b786c7d6adf73cf80a2dcefcb80b2
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/pbw?utm_term=quiz+general+knowledge+multiple+choice PDF link annotation
    • https://vizazoxo.weebly.com/uploads/1/3/4/6/134600102/ridefamijidogepored.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/xonedetezibomu_zuseno_dodevonuruwum.pdfIn PDF document text
    • https://viwajojavejad.weebly.com/uploads/1/3/1/8/131858172/4012700.pdfIn PDF document text
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/9870633.pdfIn PDF document text
    • https://palajuwasodix.weebly.com/uploads/1/3/2/8/132815908/1601801.pdfIn PDF document text
    • https://tabetigilazewa.weebly.com/uploads/1/3/5/3/135392987/vusamonaf.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/38793.pdfIn PDF document text
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/dozogotudexusek_naxaguz_zujino_musoziritoko.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/dd4a74fd4dd.pdfIn PDF document text
    • https://xijutenidipes.weebly.com/uploads/1/3/0/7/130775364/2767252.pdfIn PDF document text
    • https://milunuvaxifefa.weebly.com/uploads/1/3/3/9/133997440/wenofefulolaxuj_dekalak.pdfIn PDF document text
    • https://bosopezimewuzur.weebly.com/uploads/1/3/4/3/134313362/1565255.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/8334423.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/4128274.pdfIn PDF document text
    • https://povixifanob.weebly.com/uploads/1/3/7/5/137517449/bipoxatirawipo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizunebapod.pbworks.com/f/classification_of_words_in_english_language.pdfIn PDF document text
    • http://risanafupek.pbworks.com/w/file/fetch/144887541/basic_kanji_book_vol_1_free_download.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/gorirefakajibujevam.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144844005/what_desserts_can_you_make_without_eggs_and_milk.pdfIn PDF document text
    • http://tijigika.pbworks.com/f/71124783434.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/w/file/fetch/144733569/ramutu.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/the_other_side_of_silence_book.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_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 5576 bytes
SHA-256: 298393dec6b207480038c1affc6501166c2394c946d20928ea4647b2c36e7eb9
font_01_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 11412 bytes
SHA-256: 1e590c24832b2088d34782afe11ae7ca916a9e28005f48d3f3a99d45e1bfd2fa