Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf008298812e54a…

MALICIOUS

PDF

74.1 KB Created: 2021-02-10 05:34:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8840faeda8c2f0a2868b9aa353a8343 SHA-1: b26d218f94eaad6e86d97bfd366557b18bf6e1f0 SHA-256: 4bf008298812e54a877617fcfb95065ff6d466ecff0e22aca5d3a36d652bfb32
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing content, aligning with the spearphishing attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jottigo.ru/aws?utm_term=cedarcrest+middle+school+uniforms PDF link annotation
    • https://cdn.sqhk.co/figegixo/og0dzha/armageddon_chess_odds.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/qgcoS22/pidavel.pdfIn PDF document text
    • http://lejebodaz.22web.org/acrobat_dc_pro_subscription.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/egEQjjc/kiluriz.pdfIn PDF document text
    • http://tuimag.ru/fusoxidareki661t6.pdfIn PDF document text
    • http://lewulumotuf.iblogger.org/violin_and_cello_sheet_music_free.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/refokef_tikafixu_xopagerawo_ropiw.pdfIn PDF document text
    • http://love-cosmetics.shop/rojemajoralevugirne27.pdfIn PDF document text
    • https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/528740.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/dTigxia/best_free_open_world_games_xbox_one.pdfIn PDF document text
    • http://natur-green.fun/art_collection_color_by_number_pokemondgrbw.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/jjjavib/23377929979.pdfIn PDF document text
    • https://tifozofazok.weebly.com/uploads/1/3/1/3/131383738/4e6acc617cd30a.pdfIn PDF document text
    • http://arm-watch1.club/tolazipwbyol.pdfIn PDF document text
    • http://experiment.website/84903832122mrtds.pdfIn PDF document text
    • http://mxbur.fun/beat_saber_soundtrack89f3c.pdfIn PDF document text
    • http://rameautbxy.space/27135953010h1b7k.pdfIn PDF document text
    • https://lapunowelozod.weebly.com/uploads/1/3/5/3/135337348/vonodalejaxizaj_kamefizafigifus_jasemadibaxosu_tezopowesis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satimizatojuge.rf.gd/82453368706.pdfIn PDF document text
    • http://levurugagizov.rf.gd/pajidadamisa.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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 5168 bytes
SHA-256: 261b71b3f9d3421c6f17ba202fcca27a4e5ea2fbcc1777dc8e9cd0bd3c6fc58f
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 9852 bytes
SHA-256: 0a0f002d70d551cc3b582245caf9e6ab3f89cfc1633db342fb1ba4cbb57e137b

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