Malicious PDF — malware analysis report

Static analysis result for SHA-256 476408db6b3ee6bc…

MALICIOUS

PDF

76.0 KB Created: 2021-05-08 12:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 05cba11609322d4f95aa02c645bea633 SHA-1: 7a71420d7c4614a73bca38b8834a23d6cb120943 SHA-256: 476408db6b3ee6bc79c6a0da44916a4b40dd95dd34434501003bd9731a028f7a
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the embedded URLs and the heuristic firings suggest the document's primary purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=what+are+like+terms+in+polynomials PDF link annotation
    • http://ceter.xyz/xewezuj28w1e.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/figewW8/free_samples_stuff_baby.pdfIn PDF document text
    • http://nezowopag.iblogger.org/17506504492.pdfIn PDF document text
    • http://gigezojiradof.scienceontheweb.net/najurigutijud.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/VgemHPv/first_person_shooter_games_for_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jFO1kgj/horizon_telemedicine_policy.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/bUopagt/tanks_ww1_impact_on_warfare.pdfIn PDF document text
    • http://gezinuduwep.medianewsonline.com/free_download_urdu_islamic_books_in.pdfIn PDF document text
    • http://help-bluebadgecenter.com/hp_officejet_8600_ink_cartridges2hilo.pdfIn PDF document text
    • http://samettemiz.xyz/jurnal_akuntansi_manajemen_keuangan9vyh1.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/fixabitiwutanul.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/je7miju/85421366571.pdfIn PDF document text
    • http://oneitstore.info/dafixeku6h05b.pdfIn PDF document text
    • http://baffer-shop.space/xubejefulajw7l69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06e918f-d94f-4c0c-9a43-4eebc3ddef36/jepemekufat.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_fc61f3bed68a41788a4ca16e68966673.pdf?index=trueIn PDF document text
    • http://dulaxidej.epizy.com/dumekevitenakibibudakirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429ad915-d4fb-4317-a1bc-388b59f3892c/fejijifolokogeropo.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_9399cea1f31a471ab59f9da5cfae61a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d57a078-728e-470b-8dc1-71aa4500e612/wirovaxeguvopuxazajawu.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_71deec99d6ec4ca9aa721c979fc7c0f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/830c1b2d-f986-43ea-82dd-ff9883052b49/math_worksheets_for_1st_grade_word_problems.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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 5236 bytes
SHA-256: 91560395f58ec462541a796f3b35949b602278943008e439f8e5a46798899cc0
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 11048 bytes
SHA-256: b000bbc3965cd8c604fb106d0a363cbb9bceef94410cc1c6442075c27472841b