Malicious PDF — malware analysis report

Static analysis result for SHA-256 19767050296a372a…

MALICIOUS

PDF

80.9 KB Created: 2021-02-12 18:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b0a77b8d49a1723aee26d61e0f7d2cfb SHA-1: 11f46e8deed398f827e2ec4b0a15bfbb218015af SHA-256: 19767050296a372ac5070f595e71019a4f3d3376166f074828a1c9ff5ffa0823
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 SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=flexible+gooseneck+makeup+mirror+reviews PDF link annotation
    • https://webonuru.weebly.com/uploads/1/3/1/4/131437172/78bac4cc91122db.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/816188572bd37.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/f90835b66.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/fotasela-kasowegev.pdfIn PDF document text
    • http://vakexuk.22web.org/acog_gestational_diabetes_guidelines_2019.pdfIn PDF document text
    • https://demavagof.weebly.com/uploads/1/3/4/0/134017100/979131.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/5083afc.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/5289516.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/fanibiwot.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/velosojunetokal_jotenugax_dalisod.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/b248cff3a40ca.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/dajisiberafono.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekujekodabudu.epizy.com/22048256841.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/kao_corporation_annual_report.pdfIn PDF document text
    • http://bonizigajivoxi.epizy.com/punatutuvigurijubimo.pdfIn PDF document text
    • http://zipoxibel.epizy.com/18249364129.pdfIn PDF document text
    • http://dalotatafajadad.epizy.com/attachment_of_earnings_form_uk.pdfIn PDF document text
    • http://mapodivopabo.rf.gd/canadian_rheumatoid_arthritis_treatment_guidelines.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_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 5632 bytes
SHA-256: bf0f14ae99c8b645a95ce362e1195be4cc71e895feab2df5cd5fd23cb198ab04
font_01_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 11280 bytes
SHA-256: 8fa0541686451b91366303457cdc5af60471ab5ba6918b2f13aaa89597c453ae

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