Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca54f5526f229401…

MALICIOUS

PDF

65.4 KB Created: 2021-02-28 12:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0c19758b5f4c00c10106179c836dd5ee SHA-1: dbbd213cc62984e386f0a1cbf6e2872544518e7f SHA-256: ca54f5526f22940186bbdaaaae6b396da5078e28f0a74c084d4e2c791c59e69d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to contain keywords related to job searching, indicating a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=interior+design+assistant+jobs+atlanta PDF link annotation
    • http://jaralet.getenjoyment.net/49557562321.pdfIn PDF document text
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/kakosum.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/jhaBkhc/heroes_of_order_chaos.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/how_to_write_a_strength_training_program.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/how_to_trade_options_on_td_ameritrade_youtube.pdfIn PDF document text
    • http://kusabagibaziguw.22web.org/binh_phap_ton_tu_tap_1.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/rifThgm/sovux.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/yhhhiif/weather_chicago_october_25.pdfIn PDF document text
    • https://buronoveze.weebly.com/uploads/1/3/0/7/130739674/fuwevegosamivax.pdfIn PDF document text
    • https://maloxozalujov.weebly.com/uploads/1/3/4/6/134624338/a45e012b.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/kiteguj.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/Lvthbhj/top_gun_shot_glass.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxisopepoxozo.rf.gd/ipad_mini_4_price_in_jarir_bookstore.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_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 5148 bytes
SHA-256: 67256e7f43672767089e39f14b25c10d82560944451453aa9561543fbb0c6c77
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 9324 bytes
SHA-256: 3e213fdb449f72883bc48549dd8eb4dc9c0b74b55ab2b69f9d82fe2e8f0a5a89

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