Malicious PDF — malware analysis report

Static analysis result for SHA-256 6381d7f0e8f1ca29…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 21:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d643aa678ca5561cf020b5c4debe3d4 SHA-1: af4f307609e4e3ed3c0c0ea1cc519509d1bc8c84 SHA-256: 6381d7f0e8f1ca2921857263e632c0bd3e38e0571d8db452fe9677ee56298dd8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to attract search engine traffic and potentially serve malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document's primary purpose is to redirect users to external sites that host further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=periodic+table+of+elements+list+with+atomic+mass+pdf
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/nirut_nakowit.pdf
    • https://cdn.sqhk.co/sefibenip/ciiA8hj/sajejavozuridomakaxi.pdf
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/3508271.pdf
    • https://cdn.sqhk.co/fiwujumejuf/hhwgiEV/32514024308.pdf
    • https://cdn.sqhk.co/fajoliteve/XqbNIjb/92594521024.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/xubojutumoko-wepodimilad.pdf
    • https://cdn.sqhk.co/wituruxa/iFTjuid/the_outbreak_2019.pdf
    • https://cdn.sqhk.co/towevefizub/iuQhzje/stickman_shooter_games.pdf
    • https://cdn.sqhk.co/jigekuragige/jalgghf/jabivi.pdf
    • https://cdn.sqhk.co/liripudeb/ajjhdie/mufoxepalaruvanuga.pdf
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/guvakepafa.pdf
    • http://vutunema.mypressonline.com/child_counselling_techniques.pdf
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/nesuv.pdf
    • https://cdn.sqhk.co/tememukafosu/lEvjdt0/17149023353.pdf
    • https://cdn.sqhk.co/kegufamop/hjjb7WL/my_walmart_schedule_app_canada_iphone.pdf
    • https://cdn.sqhk.co/zirizowesaw/ii5fMjb/ezgo_gas_golf_cart_micro_switch.pdf
    • https://damatabawapu.weebly.com/uploads/1/3/1/3/131379320/d204f68c535d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://viwuwijagabote.myartsonline.com/what_temperature_to_cook_half_ham.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_off0000e792.bin
384062e4e2b6d5b118225a80429c64fec7ad6354c8248c9fef70bfc0c6f0e3b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 5628 bytes
font_01_sfnt_off0000fa94.bin
1b6c77400455a9cd55545cd74c8e527e1f05557703c733e72e269ec886b0dba4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 11256 bytes