Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4acf7cb38cf84af…

MALICIOUS

PDF

75.7 KB Created: 2021-02-22 03:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 94659df3f3b22958ef4109028a69aab9 SHA-1: c89ace02cd5de35e41af2c090c414a669131ac99 SHA-256: f4acf7cb38cf84af2165d7712e3ebe3ba0180adda0ca7198a07590bcce952262
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 manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. While no scripts were extracted, the structure and URL patterns suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://seumenha.ru/wix?keyword=conceptual+physics+chapter+25+plug+and+chug+answers PDF link annotation
    • http://lefegesitorezod.iblogger.org/gre_argument_essay_pool_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/o0ohJic/lexorifasagonutadokeb.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/Uhiihjf/39095786656.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/bNwx2ih/megepuwusuluwofofumonoku.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/jjfhdib/63011912017.pdfIn PDF document text
    • https://cdn.sqhk.co/vizodejo/3ija4Cm/10453174384.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/fGQojct/jovizo.pdfIn PDF document text
    • http://bcipreactivaperu.com/matrix_multiplication_practice_worksheetimsyj.pdfIn PDF document text
    • http://inter-kalinka.ru/goboliim0p2.pdfIn PDF document text
    • http://endi-itali.space/69280035423un3z.pdfIn PDF document text
    • http://compte-cmbretagne.best/venopabezem3x8lf.pdfIn PDF document text
    • https://fugowekarulosom.weebly.com/uploads/1/3/4/7/134700114/dc895052116.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonuwufif.epizy.com/24469894459.pdfIn PDF document text
    • http://faminosokaru.epizy.com/94213294542.pdfIn PDF document text
    • http://tawatibajat.rf.gd/treasure_hunt_clues_with_answers_in_english.pdfIn PDF document text
    • http://mituzoleti.epizy.com/livro_ortopedia_e_traumatologia.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5692 bytes
SHA-256: c914887671c6d6c684bea35a459f330b321b89f0dd4658d55e54ccdaf2750bea
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 11040 bytes
SHA-256: 67ee20925d8ae32962b4ab88b09f68820d84f95c85378731551dcf599a01cadc

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