Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79f55bbc206ebea…

MALICIOUS

PDF

73.7 KB Created: 2021-04-04 11:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7c6b7b9796e70f902e864602021b9e83 SHA-1: 91c9b580287095934635afa18e5e0219bf4c0cd1 SHA-256: b79f55bbc206ebea722cfbdb494bd3cd834880bebed2518d32c3609a5b202735
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML heuristics confirm maliciousness, with ClamAV identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=nadamoo+barcode+scanner+expert PDF link annotation
    • http://proba7.xyz/why_do_my_sony_wireless_headphones_keep_cutting_out7agqj.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/ashton_kutcher_pay_per_episode_of_the_ranchgr3du.pdfIn PDF document text
    • http://circus.market/marco_s_pizza_bowl_recipedtv6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fd1fc0b1afa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_605ef656bfc21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fd3ced7df65f.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/dE9fibt/download_game_trap_adventure_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_6044de57ee6a6.pdfIn PDF document text
    • http://sreview.online/me_myself_and_lies_videoskd30e.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/KMhjGqm/zapuxutogoponatosokuxu.pdfIn PDF document text
    • http://siankaanmexico.com/49676906804ay6ga.pdfIn PDF document text
    • https://cdn.sqhk.co/mimizajig/siaMjgK/xijefivivudexidigademo.pdfIn PDF document text
    • http://yourdesk.website/whirlpool_duet_washer_inner_drum_replacementyeiej.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/gcAadwz/iphone_x_ringtone_not_working.pdfIn PDF document text
    • http://chambreop.xyz/dnd_backgrounds_homebrewdmbvt.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/pirosisob/what_do_you_call_the_night_before_christmas.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/87064565181.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/balance_druid_3._3_5_pve_guide.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_d2f0275477bd4d279b2894ccfb4d6b61.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_a897fea198b54130ac6b6c36b0810a60.pdf?index=trueIn 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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 5364 bytes
SHA-256: 634eaf6235aa33f22ad2c719f1c77e7f22195e34143618f1e98107ab7e9ac87c
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10980 bytes
SHA-256: e11792e87c5745baad8dccb4e0a8523c2bf45adb2e9b83972b714ee107d4710b

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