Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c07b1fd836840f…

MALICIOUS

PDF

97.2 KB Created: 2021-06-02 21:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2d469252481f0707960a71ca953da1b5 SHA-1: 12c41748f3846e09d8193b4f960c1389f57560e4 SHA-256: d2c07b1fd836840f405c2de60f73ba0141e9ee56bc9c66cb50b062014fb3cd88
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=smok+nord+2+vape+while+charging PDF link annotation
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/39b910f1dde7fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410952/normal_5ffe416137b8c.pdfIn PDF document text
    • https://nuluvefum.weebly.com/uploads/1/3/3/9/133999802/mazixegaf-naxaxada.pdfIn PDF document text
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/07b3fb2bb345f.pdfIn PDF document text
    • https://fasosizive.weebly.com/uploads/1/3/4/3/134351581/5b08a1f.pdfIn PDF document text
    • https://jumabesabixoduz.weebly.com/uploads/1/3/4/3/134368642/butaguseserusipizuf.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/nerizuxu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464995/normal_60b1981beea68.pdfIn PDF document text
    • https://xogupugisi.weebly.com/uploads/1/3/4/1/134109029/xasonananevibepebo.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/7d576ff2-2344-4994-a8d7-2cac99068ef4/tipos_de_sistemas_politicos_y_economicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959501f5-5bf0-45db-bba0-e750101ba8da/bow_tie_cinemas_movie_times_trumbull_ct.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144520329/8975360456.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/37767552877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5a325f-6b12-441e-a042-5cf66641d957/sobasexorimaduwosavavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb25f08-7dfe-45cb-b0d5-41dd44f45516/size_guide_for_childrens_clothing.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 3688 bytes
SHA-256: a57ef055f676ecc5e424ee1b02b0b4232f28cb8980ed02916cf4e2f2d1e0d0f6
font_01_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 5760 bytes
SHA-256: 4836a47d461c566130886da042c5d72f875caf2194c25f59630143f73cbc892a
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16740 bytes
SHA-256: ae1df295b5d90cb320b6d3d66cad53214d925c092547fc350330b488af2ea510
font_03_sfnt_off000160f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F3 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7