Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc75bf3ed17751b6…

MALICIOUS

PDF

83.0 KB Created: 2021-04-12 01:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d5139737f64a27685f05bc4807b9a30 SHA-1: 9a265d03f0f3fc74d2d146dde1b4f6262b78b9b8 SHA-256: bc75bf3ed17751b6a5cbbec94b0fe389d43851355b68b4b6c6716701a8c327dd
146 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic for tech-support scams or billing fraud lures. While no scripts were extracted, the presence of numerous external URLs, many on disposable hosting, suggests a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=exerpeutic+4000+bike+manual
    • https://niberijiv.weebly.com/uploads/1/3/4/0/134017170/628680.pdf
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdf
    • http://idealica-italiaufficiale.website/793824515785uxka.pdf
    • http://axecheat5.xyz/alcatel_one_touch_flip_phone_user_guideyxtkl.pdf
    • http://fulilip.iblogger.org/probability_worksheets_high_school.pdf
    • https://xilapisozigiv.weebly.com/uploads/1/3/4/3/134341565/miwaxej_zupuwusepow_wuvopi_sirenutikuvixu.pdf
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/9570246.pdf
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/midazog.pdf
    • http://refajunabewatog.iblogger.org/partisans_of_allah.pdf
    • http://1xbet-football.fun/81434652718fnr60.pdf
    • http://womenita.fun/the_vampire_diaries_season_8_episode_1_bg_audiouei2w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/840626e8-43cd-4980-972d-f031124288f0/gerald_ford_quote_our_long_national_nightmare_is_over.pdf
    • http://romepasuv.myartsonline.com/15159046167.pdf
    • http://zazupixuwup.rf.gd/banyan_tree_drawing.pdf
    • https://uploads.strikinglycdn.com/files/0e2dc44f-88ae-462c-9cea-91ab9e554e9b/33587359163.pdf
    • https://uploads.strikinglycdn.com/files/0f81c63b-2a52-4205-9dad-c033d2fe2998/what_to_bring_to_chick_fil_a_orientation.pdf
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_c530e5b1472c4939ab9d80ea09f7c7af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e99d7ef-8e01-47f7-af6f-a74d988c9630/wiradopififofar.pdf
    • http://lusetazok.rf.gd/diseos_del_proceso_de_investigacion_cualitativa_sampieri_resumen.pdf
    • http://wipidomi.rf.gd/presto_16_inch_electric_skillet_glass_lid.pdf
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_bc74930ae44a401d97b99891eafc9270.pdf?index=true
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_617bad46b91149ed9b8a1567a15a894a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f771.bin
e26715c5dc34a992577ce704fc4f9886da138cef1e7f7d41257dca5fe86e895c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 5132 bytes
font_01_sfnt_off000108d3.bin
2ffb32d2ce2dc9af7ca921ea5c4028fbc6265cec2889f92fbf9136db63c5734f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 11836 bytes
font_02_sfnt_off000130cd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 4324 bytes

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