Malicious PDF — malware analysis report

Static analysis result for SHA-256 83791896dd1fb488…

MALICIOUS

PDF

67.9 KB Created: 2020-12-24 06:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 22fc1d5089610f6687bb2a72ef4c1294 SHA-1: 81924a3c34bf258a363835514ffda43b782ee346 SHA-256: 83791896dd1fb488e5022c87eaa733f709cbe820f2723e6bc97071b9f1dc2d57
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The primary malicious URL identified is traffnew.ru, which is likely used to serve a second-stage payload.

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://traffnew.ru/123?utm_term=campbell+county+va+school+calendar+2018-19 PDF link annotation
    • https://cdn.sqhk.co/xezojutatow/hcajjb2/45473062158.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/relewakunegonas-zoxiz-deguzemado.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/6114180.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/pazura_doposixefu_nexifexufeg.pdfIn PDF document text
    • https://jodiwovuf.weebly.com/uploads/1/3/4/3/134368652/fosobevevapeg-foxode-vaduwamatewisaf-gulatanasip.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/vabori.pdfIn PDF document text
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/mufukodupitexavudo.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/4143df70-323e-4a91-a020-f1fce341a6c5/the_joy_of_game_theory_an_introduction_to_strategic_thinking_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da75f473-14f4-4219-b6f7-9b0ece9bfb7c/19845728922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a8ad50-a5fc-45ea-a697-6f61ecfc91c6/la_rebelion_de_atlas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aaf39ce-c4c8-4c49-a17d-7e88cae1be7e/the_astonishing_color_of_after_age_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/zunivobifudukazisos.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/guideone_insurance_claims_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bae1c15-3194-4b17-8746-fac1e1e32846/71106750637.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_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 6228 bytes
SHA-256: 90be68b42f32cad7743c22470017c5e501d313dc5871f004a5dfb4b799c5ab38
font_01_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 10564 bytes
SHA-256: 620aa42372e513aed0d1551681f4d71b0b7b37ddf64d67b73b17c9cd70739519

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