Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0521148cd9e425…

MALICIOUS

PDF

117.3 KB Created: 2021-05-14 16:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4fa9ab157a3ea4db698f8a38f887bfba SHA-1: 2ba272bd65e4a2b67eb8d3b57ffda98ec555508f SHA-256: aa0521148cd9e42560d6415dcb532c9d07716e23a8a98606cdd8d63f6400ef6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing 30 external links. The ML classifier also returned a high score, and ClamAV detected it as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lozipotod.ru/strik?utm_term=marques+de+sade+books PDF link annotation
    • https://cdn.sqhk.co/vorinugobol/higRTlR/the_hangover_elevator_baby_scene.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/ggeichc/dark_sword_ds3_any_good.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/jgja8Ve/86197608030.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/a9e1a19dc3a054d.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/kiiif7Z/download_shadow_skateboard_mod_apk.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/jugoxudufoxipiz-dojugukumupo-rufafokasugag-milajubix.pdfIn PDF document text
    • http://lufoveferezudu.22web.org/anamika_drama_background_music.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/5b18ae9f97.pdfIn PDF document text
    • http://rerutexab.iblogger.org/fudanekowipebarajolabun.pdfIn PDF document text
    • https://vomukefepa.weebly.com/uploads/1/3/1/8/131872153/78827.pdfIn PDF document text
    • http://zebakabum.iblogger.org/how_can_i_pay_off_my_hecs_debt_faster.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/vavabi/wugur.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/91952911865.pdfIn PDF document text
    • http://dusilasazeli.rf.gd/10336963956.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/what_does_the_suns_atmosphere_consist_of.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/la_plage_yann_tiersen_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/fumaliretekafafuba.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/whiskas_kitten_food_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/gb_polyp_follow_up_guidelines.pdfIn PDF document text
    • http://jijetebum.epizy.com/wazabelosusuworebako.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/adanaspor_siyah_forma.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/fun_android_games_with_friends.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_off00018984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18984 5120 bytes
SHA-256: 174ebac43571148b10ac09ae0469dfbea31dee62c95ffe8e46e5e065b271766e
font_01_sfnt_off00019b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B01 14208 bytes
SHA-256: be6aed0bcd7de7d4b532fddbedf760b0165e37c73bc496ca0e440cb69ca2ed11

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