Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf421378cb42d65…

MALICIOUS

PDF

67.7 KB Created: 2020-12-18 09:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4472ca3d760d8fa5ff67b28fe7014338 SHA-1: cec8c1f16f5f9a2f632c54b566e59671524c45da SHA-256: caf421378cb42d65dc691e4f15354ceefbced1f4a42edafd71477e357e5a2ac2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary external links points to 'trafffi.ru', which is suspicious. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?utm_term=hearthstone+hallow%2527+s+end+2019+arena+guide PDF link annotation
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/muzuvudamewukol-begefakewivivif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f8719d394f08.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/8137274.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/mefilanube-sijajof-nuralenutuduz.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/rebijipenu-sivurukenil-zifapazikux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384304/normal_5fcc76b7175bb.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/denepawudunudak_vofuxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/do_light_independent_reactions_occur_during_the_day.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/75247684555.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/39795243600.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/aia_full_form_in_bsf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6cd96f-3ef7-4970-8234-aa22f51d4eaa/xaromovadinajatogukog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71503437-9bf0-46ba-9d0a-a20f62ccc8a2/gidasusenemobivaxasivozed.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_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 5656 bytes
SHA-256: a369f36bb9d6c8becc1ef13ad31bdaccad5f2185d5addda48899153e1fcca1b5
font_01_sfnt_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 10704 bytes
SHA-256: 077eab53eed40ad24100316b4cb32f48753b07b33d230c8717ee80469b194332

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