Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca451473c655ea19…

MALICIOUS

PDF

70.4 KB Created: 2021-03-27 23:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b5f5ba418b718f8c383a69add3f3cb01 SHA-1: 5a4397b10fd6206024c36875eff6135433a93e3b SHA-256: ca451473c655ea19583c0bb8e154ae68bee2272b173fea384513f8b2eef364f0
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malicious redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=pathogenesis+of+heart+failure+pdf PDF link annotation
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/8859911.pdfIn PDF document text
    • https://nigenodesi.weebly.com/uploads/1/3/4/4/134480521/7092985.pdfIn PDF document text
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/566041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5ffe0ad64d4e0.pdfIn PDF document text
    • https://cdn.sqhk.co/tatomaxeriri/Y5ideXu/missiles_fired_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_603e7e4778431.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/chemistry_a_molecular_approach_4th_edition.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/fakufenato.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/91cdad911.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/i3jahdd/altered_ego_salon_spa_tempe_az.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
    • https://uploads.strikinglycdn.com/files/541f490f-1c65-43da-ac9d-17399e008b63/57264074322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59214946-5c65-4f96-ac85-917d55ea993d/wunokoxozebupaxazoseluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601a0621-d7c0-4560-9cfc-6459705815b2/levaxoda.pdfIn PDF document text
    • http://fovuderes.rf.gd/86766757971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a77cb12-a831-4e13-8db9-720e94217b69/can_i_use_autocad_on_macbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c6d367-aa86-4393-ac75-d8d8f3f0b290/the_divergent_series_allegiant_full_movie_in_hindi_dubbed_free_download.pdfIn PDF document text
    • http://radawewivilu.epizy.com/bisakoxebeviduz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 5188 bytes
SHA-256: 624b2c2711cd544827ce5c65332632b4d79010a14e66670ac2cc0a075e2ef081
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10156 bytes
SHA-256: acb260624232db37311d24078c6b58d2c69d285412b89f3f26e5271acac121a5
font_02_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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