Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c6cbffbe78b431…

MALICIOUS

PDF

77.9 KB Created: 2021-02-12 08:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a79f4e6f6400b8f1fbfa95287cdec3d0 SHA-1: 73742342a0c3151c5c66731573a52402fffce1cf SHA-256: b0c6cbffbe78b431350c8020e7bf03fee7a7132a3ade03fec869ae4c79ec5689
304 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to obscure the final malicious destination. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies an attempt to phish for Amazon credentials. The presence of ClamAV detection and ML flagging further supports the malicious classification. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/2754284.pdf.
  • 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.
  • 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://crophysi.ru/123?utm_term=five+faces+of+oppression+sparknotes In PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/2754284.pdfIn PDF document text
    • http://gemajesubon.22web.org/burning_series_manager.pdfIn PDF document text
    • http://nncucuucuc.space/auxiliar_de_tecnologia_da_informao_salarioq9fqq.pdfIn PDF document text
    • http://vashastrahovka24.ru/criminal_case_mysteries_of_the_past_case_28al9ap.pdfIn PDF document text
    • http://lalat.space/copper_scrap_prices_near_me00p5d.pdfIn PDF document text
    • http://strapslap.online/421953508291ujgu.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/mixefobifumafa-terexamul.pdfIn PDF document text
    • http://vuxokiwi.22web.org/2730379827.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/91c90c3d7dce6d.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/zuwisojavepabewe.pdfIn PDF document text
    • https://vaxulisexo.weebly.com/uploads/1/3/4/6/134600260/7318dbde283bb.pdfIn PDF document text
    • http://aduo5.online/69736231280n7588.pdfIn PDF document text
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/42fca2b45f6234.pdfIn PDF document text
    • https://milajibejo.weebly.com/uploads/1/3/1/8/131871424/retepuzuzefo.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/f855e.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/xezinetimotusi.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://veduredetud.epizy.com/best_soccer_games_for_android_under_50mb.pdfIn PDF document text
    • http://putotapuzavip.rf.gd/cfg_to_chomsky_normal_form.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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 4844 bytes
SHA-256: 2f6a000edb5b3377afe8d70e13b03e94dd540724d0c32498cdeef48bca321f37
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 11260 bytes
SHA-256: eb59c0cf90689f3e0303e03fe503c6d36d6302d05d52220611052b720a6b3beb
font_02_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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