Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f82445ba42b0a0…

MALICIOUS

PDF

72.4 KB Created: 2021-03-01 16:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0fb874a2416e1efc9477b3bdc7972a1a SHA-1: 08ccc200f9f2bd55402f87894c5886e8fa1e266b SHA-256: c3f82445ba42b0a00ef317a7991cf3458e74252ccfdc533aa64dc592b9a3b113
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain search-related keywords, reinforcing the lure of a deceptive search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://xajibur.ru/123?utm_term=are+netgear+routers+compatible+with+xfinity PDF link annotation
    • https://puxizabub.weebly.com/uploads/1/3/1/4/131406372/7aa2525f0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fd071316e98c.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/nafagupilaw.pdfIn PDF document text
    • https://dixodenifafazud.weebly.com/uploads/1/3/1/8/131856669/1851944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_5fd198c040edf.pdfIn PDF document text
    • http://katipef.medianewsonline.com/what_is_the_capacity_of_kenmore_90_series_washer.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/15881971672.pdfIn PDF document text
    • http://vabakavolageni.22web.org/i_ready_answers_level_g_math.pdfIn PDF document text
    • https://cdn.sqhk.co/rowavarop/iagg4ii/39728834517.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/a4ibpVC/zenibagatawurupo.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/how_to_thread_bobbin_singer_confidence_quilter.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/fatagobe-defadupokoga-desajuj-dezazobikeruxu.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/3772616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_5ff14086c1546.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/Ygiie6l/93560239472.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/ajgicVp/gta_5_story_mode_cheat_codes_pc_money.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokimutopilar.epizy.com/vibosoft_android_mobile_manager_apk.pdfIn PDF document text
    • http://medexode.atwebpages.com/the_bear_faulkner_review.pdfIn PDF document text
    • http://xakireponamo.rf.gd/newborn_baby_pics_hd.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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 5820 bytes
SHA-256: a7559e315179a2ff17000c95d8e3946fd937f442a8b4e11bf054ca120b0c4f84
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10532 bytes
SHA-256: d7b45c95eb73db26317b87206959ab6570b74655c0de3af44db5e6f17006d1f5

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