Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9540fb371bf2902…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 09:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4ca45c7aa86b7b69c768f053c54ef32 SHA-1: 21f2676736fc481b5324415fe95ac5785748f9a2 SHA-256: d9540fb371bf290270822ae33f0e4a5acdac896bd1db414eea9ce2591d21e3a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL points to a site that appears to be part of this farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly indicate malicious intent, likely related to phishing or distributing further malicious content. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=answers+mr+barton+maths
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/mevigikud.pdf
    • https://zisowuwaxafo.weebly.com/uploads/1/3/4/7/134700917/sijikin_xojeroze_kilekez.pdf
    • https://jopuxokoxi.weebly.com/uploads/1/3/4/3/134350500/nugak.pdf
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5fd3691daf12a.pdf
    • https://pafuzoxim.weebly.com/uploads/1/3/4/5/134585506/xoxemoda.pdf
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5feb6a4990c4e.pdf
    • https://tokemata.weebly.com/uploads/1/3/6/0/136081978/9403080.pdf
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/gegatedu_senoboka.pdf
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/madaxigofepamirumi.pdf
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/bavalanuvajidutam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeponowon/how_to_use_garmin_delta_xc_series.pdf
    • https://s3.amazonaws.com/wewuxuviwar/arabic_malayalam_dictionary_manhal_free.pdf
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_b9e2ea3f516248959164a40138252e7f.pdf?index=true
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_7a08858dd14246ca93acf839f89e5625.pdf?index=true
    • https://s3.amazonaws.com/vuxirefare/date_sheet_2019_punjab_university.pdf
    • https://s3.amazonaws.com/janodojivi/wevesemiboji.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/what_is_the_best_live_bait_for_crappie_fishing.pdf
    • https://s3.amazonaws.com/tuzamada/80933685852.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1e.bin
a8b583c1a09fac543e69d330f6383be41497a66691601ec02f5f07fe428f80cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 5112 bytes
font_01_sfnt_off0000fe62.bin
beadaca8920da34679d44b02ae79ec971c2d09300b091fde772bd4d1304cb123		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 10500 bytes

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