Malicious PDF — malware analysis report

Static analysis result for SHA-256 9231de3dd325741b…

MALICIOUS

PDF

86.6 KB Created: 2021-03-14 19:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a7a5b506bbe3ed2d18ceb552e68beb SHA-1: 9a0047ad20dccbb07adb0ad477911d6c09ae8919 SHA-256: 9231de3dd325741ba023230fda03007e57e01672be100762e7e2c9a23621b268
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are designed to mimic search results or download pages, indicating a phishing or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/wix?keyword=british+home+stores+bras
    • http://discount50it.pro/xujejorakusbplj.pdf
    • http://wemuwetafivaxe.sportsontheweb.net/halliday_resnick_krane_physics_volume_1_download.pdf
    • http://smartcreditscore.info/80252265122bg5e8.pdf
    • http://rimka.xyz/44686773089838no.pdf
    • http://sinoxaju.mygamesonline.org/workday_hcm_training.pdf
    • http://badgesverified.com/vakotipagulanimf5a70.pdf
    • http://whitetwo.space/30381898261rskz2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_1a5c7e82e9d34a269a84e1aca919b526.pdf?index=true
    • http://beliraguw.onlinewebshop.net/case_study_books_free_download.pdf
    • https://s3.amazonaws.com/toguvaju/jaxigeguzanoximubiw.pdf
    • https://s3.amazonaws.com/wizitifowubux/macbeth_act_3_scene_1_test.pdf
    • https://s3.amazonaws.com/penefelomiju/bodawukevunorej.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_1f9cbac5a34b46f8a2d240af764f79c0.pdf?index=true
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_f302877b40da45d684adda34636d51e1.pdf?index=true
    • https://s3.amazonaws.com/levumoduf/hard_math_printable_worksheets.pdf
    • https://s3.amazonaws.com/purixifusipelid/85883690933.pdf
    • https://s3.amazonaws.com/rurosaveruk/coke_and_popcorn_game_of_thrones_season_5_episode_1.pdf
    • http://taguloxutenafol.myartsonline.com/19226151122.pdf
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_eb6f8c8cfb424437a7046d25c6ea32af.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/81117389866.pdf
    • https://s3.amazonaws.com/mujesogi/google_assistant_go_apk_uptodown.pdf
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_da4e4399aca741deaed47c1e49477a47.pdf?index=true
    • https://s3.amazonaws.com/xovajukoxin/29993673626.pdf
    • https://s3.amazonaws.com/gopuze/how_much_do_health_and_safety_managers_make.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/technical_analysis_charting_software_free.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_off00011659.bin
1168ab5adf89e7afd54e0d587c8d7f60a105698e3e592065f1cf26c96d2f016f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 5084 bytes
font_01_sfnt_off00012772.bin
e6986f78c3ddedadd15d49513106ec37e6a8bf2eb277e0ac36cd7ecab4e5e3df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 11332 bytes

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