Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ea46f102f11336…

MALICIOUS

PDF

72.3 KB Created: 2021-03-18 11:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 12d81b6136f9b24904218cb181b38c09 SHA-1: 8fbe2a0105481395b7b57d897290a17a01e281a0 SHA-256: 13ea46f102f11336fef5f34f05bd8e880b69091ed680f937f497b0fe953c370c
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 spam campaign. 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 are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=tomb+raider+definitive+edition+ign+guide PDF link annotation
    • http://vumutita.22web.org/16056421074.pdfIn PDF document text
    • http://sixuxerunux.iblogger.org/sql_queries_interview_questions_and_answers_free_download.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/pabolutobavikuj.pdfIn PDF document text
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/3c5b3832.pdfIn PDF document text
    • https://fusofopafufet.weebly.com/uploads/1/3/5/2/135294951/gotupegoguso.pdfIn PDF document text
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/7782329.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/0238fa604b28e88.pdfIn PDF document text
    • https://dajusokododolin.weebly.com/uploads/1/3/5/9/135964726/8011795.pdfIn PDF document text
    • https://pufopobumosuv.weebly.com/uploads/1/3/0/7/130776602/ragobamewirod.pdfIn PDF document text
    • https://kelulove.weebly.com/uploads/1/3/0/7/130775366/wuvamegudavin.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/kagafosonasil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_f0c2b41db77648d8850aa5f938d484f5.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_455029833824442a9326581a418d0bb2.pdf?index=trueIn PDF document text
    • http://kilarosine.atwebpages.com/biochemical_engineering_fundamentals_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/bifelex.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/96961745731.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/xugog.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/wirota.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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 5168 bytes
SHA-256: 70dd47b80270178bda098830a362637c9f7fcba07d41d50224da8c0f4632fc3b
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 10932 bytes
SHA-256: 9d9236d7fcac0b3157cab6ffa87046888d2dcc5c9053446e3b07e59a16dbadf5

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