Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e9e5c71443c8e8…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 11:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 74a43d30a5e8c99eb789d1b8e53125d1 SHA-1: 5e954f31a6d4323e41dc904af067bace38b3c2b0 SHA-256: 41e9e5c71443c8e8ec451220a4625200a4c457e5b11628ec4d89d67e85ce729e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM suggest the document's primary purpose is to redirect users to malicious or SEO-manipulated content, potentially for phishing or malware distribution.

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://zajinet.ru/123?utm_term=income+statement+vs+balance+sheet+examples PDF link annotation
    • https://fexemefamerera.weebly.com/uploads/1/3/4/2/134236105/ea2c814f8d189b4.pdfIn PDF document text
    • http://netewe8.xyz/46686658632xh01u.pdfIn PDF document text
    • https://xomugiwonin.weebly.com/uploads/1/3/4/2/134266294/mazijad-vezerovijaj-guxumufusinipa.pdfIn PDF document text
    • https://ginerapaxujivu.weebly.com/uploads/1/3/4/6/134647741/wibutig.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/6289783.pdfIn PDF document text
    • http://getallcreditscores.info/mikoruzezovisebazitwqpn7.pdfIn PDF document text
    • http://xtw2.club/335782139735gn3r.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/8439417.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/59df42c4fb9fb.pdfIn PDF document text
    • http://uchebnoe.website/jawosaralolafurinalkj6ul.pdfIn PDF document text
    • https://luzijegeze.weebly.com/uploads/1/3/4/0/134040843/b2f39cee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2012a6ae-b612-4120-ad84-e5e2d68348fb/92980941158.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/are_viruses_alive_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/photography_lighting_101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f953b06-7ca6-4a12-9469-6ceef5ad80c7/72902377718.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/boker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbeb02ce-98a8-4bcc-a4af-3dfe280ef2a1/gardners_theory_of_multiple_intelligences_ppt.pdfIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_b2ebfa1bdb04406f9233b70b0f475887.pdf?index=trueIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_b3e1dd924465434a8fd057edf30252f1.pdf?index=trueIn 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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 5284 bytes
SHA-256: 8de280d2e51004004c358f6bf802548af5a8828d0a4d3436d0ff4c9442f07a32
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 10772 bytes
SHA-256: 55bc01ae9097ea6ee454e65993fd47665d9cb69531d93a8dd563beedd25c2cee