Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da22459e483632d…

MALICIOUS

PDF

102.2 KB Created: 2021-02-15 03:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 530498243abe76001275eee5d1c0640b SHA-1: ed6e721cfc0d3f792f5b9ce3ffc131eaad39a1c0 SHA-256: 0da22459e483632db912bc76a5e53d006fd2956f4292bff9cf228ef4b72950ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one specific URL, https://druttle.ru/123?utm_term=psychology+for+dummies, is directly embedded. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=psychology+for+dummies PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5ff96c7441dde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5fc9eebd58c41.pdfIn PDF document text
    • http://es50off.pro/femom4yycc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454041/normal_60255bd4e4154.pdfIn PDF document text
    • https://vekukedabil.weebly.com/uploads/1/3/4/7/134710008/7064904.pdfIn PDF document text
    • https://dapalaboz.weebly.com/uploads/1/3/0/8/130874192/4137921.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/9724240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_6021f6729a7a8.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/ronatiduzoxij/disbelief_papyrus_fight_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/xeronoxem.pdfIn PDF document text
    • http://josejutolaxof.rf.gd/86665340046.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/card_battle_games_android_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/reelfoot_lake_duck_hunting_guide_martin_tn.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/platform_shoes_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/informer_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/process_improvement_tools_templates.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_off000155ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AC 5328 bytes
SHA-256: 5f44dd5e006ff8baedd2e785f9d7f47e6463175fa2f567209323bdd9902335dd
font_01_sfnt_off000167af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AF 10472 bytes
SHA-256: 5deb0d2cd15c90362a42dd81a8be5a5944de137244b5800cda611884881a570a

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