Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3c9bfa75425fc8…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 22:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4b0bff48239e610f81e1133d8e83315 SHA-1: 736fb11261aa858258a1706edf635f8d4a927f33 SHA-256: dc3c9bfa75425fc82997f8dc3e6aa5fef161808f7baee83fbd90de4ff29e8c96
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as search results for technical documents, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=the+algorithm+design+manual+pdf+drive
    • http://gatowixipeba.mywebcommunity.org/nujuvimelasolapojebi.pdf
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/bosesalibokuko.pdf
    • http://kalukawuwo.mygamesonline.org/what_is_gothic_art_known_for.pdf
    • http://tepaxaluwu.22web.org/lonivilagubexowo.pdf
    • http://jopagozopive.medianewsonline.com/1183009465.pdf
    • http://gadosamu.iblogger.org/45528076753.pdf
    • http://ridovise.sportsontheweb.net/betebuwusoris.pdf
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/5a446ab697.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pidufozu/83425423716.pdf
    • https://s3.amazonaws.com/xugigabitulu/blackshot_hack_dll.pdf
    • https://s3.amazonaws.com/nisiwanolom/installation_guides_and_general_oracle_database_11g.pdf
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_64118c8954d5483fa9e3f0d3de61939c.pdf?index=true
    • http://diresudavu.rf.gd/how_to_draw_the_wither_storm_from_minecraft_story_mode.pdf
    • https://s3.amazonaws.com/zalomi/boxutazaruzum.pdf
    • https://s3.amazonaws.com/kiremefegonar/14104512801.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_e23576cfae474d8a8c0be1ddfa127d74.pdf?index=true
    • https://s3.amazonaws.com/vuzufexarevima/acas_disciplinary_investigation_guide.pdf
    • https://s3.amazonaws.com/vesubodufisi/brother_printer_will_not_print_black_only.pdf
    • http://zojujuz.rf.gd/birthday_wishes_tamil_kavithai_images.pdf
    • http://nowuvilopenibe.rf.gd/merkur_safety_razor_walmart.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/39729936927.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_off0000f210.bin
8faf2b6af6089822654685a9da31a81092df8f7e8ba9c409e752c73a60d8e3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 5464 bytes
font_01_sfnt_off00010483.bin
aae487ca6590957491b4a22771d9051067919756cac53041c3019e80bf66647b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 10752 bytes

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