Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4905460af7a487f…

MALICIOUS

PDF

82.6 KB Created: 2021-04-30 17:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 759a6edc5ce8f63f6efb4f85118ed118 SHA-1: 5de8e60b260c733eb9659ac088e478f8bbde669f SHA-256: f4905460af7a487f8fcff690d106a5ddd64da4c7ad48097d30358f0ff1e11b66
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely leveraging an exploit to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/strik?utm_term=how+much+does+it+cost+to+renew+forklift+licence+nsw PDF link annotation
    • http://firstflirts.site/kixewumemapilagalewabarik8vzs.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/seventh_day_adventist_church_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zimofuzam/ifXqchf/47632912929.pdfIn PDF document text
    • http://sreda.city/singular_and_plural_nouns_worksheet_for_grade_23wlxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_600ca13aae520.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/31392897044.pdfIn PDF document text
    • http://eurosett.net/harry_potter_and_the_half_blood_prince_full_movie_reddithh7y9.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/pifojufo.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/70846251460.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/0gdBszO/bahubali_2_songs_free_2015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408983/normal_5fff97032687d.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/fhbWWjh/tegovafinezapozi.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/uhifXgj/13004826141.pdfIn PDF document text
    • http://mastericy-chistoty.ru/behold_a_pale_horse_full45tme.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/djcgf5R/bluestone_and_hockley_tenant_login.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/493762c1-004b-45a2-b5d4-a33e1f55b5fe/kofugopati.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_95e3abb34f4d456582154a9b179089f3.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_8970af2c04d3410b97c045cdb23b95f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5539b6-3a15-435c-9414-b5920aaa7743/gre_argument_essay_samples.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_936bea12e20642b3987ae7551be1af86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a89fc8d-b262-4f96-ae6b-e488de79be18/mn_driving_test_scheduling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677991c1-5202-4431-9afc-2575ea998033/why_are_they_called_pretty_little_liars.pdfIn PDF document text
    • http://pigutun.myartsonline.com/latoti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 5048 bytes
SHA-256: 90c11a053d32d567d770419c1ef64f3d2b122b7c8a18fd5ef8dbed8c5b8393f3
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 10748 bytes
SHA-256: 3db3a33f95c08e4743abd3a8d8badce08a146faee94f87e1619d726d39ee5beb
font_02_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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