Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d8504e19f481d1…

MALICIOUS

PDF

76.0 KB Created: 2021-04-08 22:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c244e0236a165d837e837e6129cc718 SHA-1: 588772a198a32020f65b3123ce327ee8efc00684 SHA-256: 12d8504e19f481d112c5381ec752cb169cbfe170afd98caba2a494bab22d3721
146 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of external URIs and a link farm heuristic suggests an attempt to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent number, consistent with phishing or tech-support scams.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://resalured.ru/strik?utm_term=office+365+episd
    • https://xukovefekafevut.weebly.com/uploads/1/3/0/9/130969731/1224852.pdf
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/97deb4fe.pdf
    • https://cdn.sqhk.co/keragipiki/henjgid/mepim.pdf
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/duwumuwowatuvufinato.pdf
    • https://cdn.sqhk.co/kivuwutu/jagfy6L/dare_you_to_move_a_walk_to_remember.pdf
    • http://gozimudowojuzun.mypressonline.com/mcdonalds_coupons_deutschland.pdf
    • https://cdn-cms.f-static.net/uploads/4455657/normal_602b85d38888d.pdf
    • http://fiwisud.getenjoyment.net/kuvalapibotorabiva.pdf
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5ff0733e8666c.pdf
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/5067658.pdf
    • http://tofugezupeb.mygamesonline.org/dowovapunilolififixovim.pdf
    • http://kegetisa.mygamesonline.org/business_environment_tamil_book.pdf
    • https://popewike.weebly.com/uploads/1/3/1/4/131407195/8039576.pdf
    • https://cdn.sqhk.co/letinumi/pgh7Xig/17271120796.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/690ddcb6-44dc-412b-9eee-7b1d853fcef6/162978353.pdf
    • http://gajamozaxekega.atwebpages.com/skyrim_load_order_guide_xbox.pdf
    • https://s3.amazonaws.com/babetafaperaxov/lg_inverter_v_remote_app.pdf
    • https://s3.amazonaws.com/vipuxafol/bagejiro.pdf
    • https://uploads.strikinglycdn.com/files/2a3cf468-fbee-489c-bba0-cd160b521aa3/honda_shadow_1100_carburetor_diaphragm.pdf
    • https://s3.amazonaws.com/baxegezivumi/bagobo_language.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ab.bin
7f36a4edfb4c7ff1e8c66d5e001c6968363dd7f3245989811d5ba37fb7035b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 5280 bytes
font_01_sfnt_off0000f9b7.bin
d0a44bbf9353c422b3227bf1ffe7f78f174f80e7b136859b7bcdf3c2582cf29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 12700 bytes

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