Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a4ae54eb39657a…

MALICIOUS

PDF

89.9 KB Created: 2021-01-25 12:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fd9ba6afa318aecc3f78ca43d74bbe69 SHA-1: 90c76ce06cecbaa7ae773cd7109a4741f961e5ca SHA-256: a1a4ae54eb39657a8522376cbcc82012c0018f24dc9b5c841387c4d3e09d5d49
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=essay+about+myself+example In PDF document text
    • https://cdn.sqhk.co/juzureniwibu/0ib5Thh/cima_study_text_e3_strategic_management.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/WS2F65q/95937758708.pdfIn PDF document text
    • https://cdn.sqhk.co/korokotuduki/heJG3Vo/kaxusosidegoxizu.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/gesgcUx/vebakuxenagodo.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/hjrvgg9/zenifinumagafowujoleji.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/icjjif4/1860872683.pdfIn PDF document text
    • https://cdn.sqhk.co/juzivadareka/jjPGAgf/pamovuw.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/d8Sicjf/chocolate_cake_cooking.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/iiiicUJ/checkers_restaurant_locations.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/514394123.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/hda4Tji/end_of_days_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadivedu.rf.gd/filtration_apparatus_manual.pdfIn PDF document text
    • http://fuwotimusajitos.rf.gd/raral.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/32112235958.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/84504094285.pdfIn PDF document text
    • http://numowun.rf.gd/7131353136.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/37554260816.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/catapult_king_game_uptodown.pdfIn PDF document text
    • http://bujitajaxo.epizy.com/xezupafemazazelebefoge.pdfIn PDF document text
    • http://fizenigapajawak.epizy.com/13739742030.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_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 5216 bytes
SHA-256: 25af46929b9689851fcfd7813aa7bd46d021d37c44f528f4703e6ee7359dcc1d
font_01_sfnt_off0001332f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 11032 bytes
SHA-256: ff7ffd2427ba19854524c9d1063ebd35922f3a00220acc486afdaa155da539b2

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