Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dc1546e1929acf…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 19:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19508fd945b2ad1fa4de4cd3c3d4b4f SHA-1: d866731c0c164749b582fd7dc7762f7040e17501 SHA-256: b8dc1546e1929acfd907e09e60b489d6e0955c11abe357bf92fb5b6b509643ce
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, suggesting a phishing or scam campaign. The presence of a link to 'yafferge.ru' with a 'quranic arabic to english translator' UTM term further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=quranic+arabic+to+english+translator
    • https://cdn.sqhk.co/revinoxu/Agdiije/52429972010.pdf
    • https://cdn.sqhk.co/dijabidasu/fih1hdm/1249194578.pdf
    • http://moxegelubopidi.sportsontheweb.net/vivofit_junior_2_or_3.pdf
    • http://sakivometo.medianewsonline.com/acca_f1_accountant_in_business_2020.pdf
    • https://cdn.sqhk.co/sakupiraf/LghhcsB/fltplan_go_forum.pdf
    • http://rolapisi.scienceontheweb.net/types_of_validity_in_research_with_examples.pdf
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/4090968.pdf
    • http://vixemifojetinag.sportsontheweb.net/anti_theft_alarm_for_bikes.pdf
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/db05f9c97e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fixetofona.epizy.com/zosusulofelikapaza.pdf
    • https://s3.amazonaws.com/gapivegek/96530521301.pdf
    • http://wuvasof.epizy.com/what_happens_if_you_get_hurt_before_army_basic_training.pdf
    • http://xovipofeguz.epizy.com/personal_balance_sheet_example_excel.pdf
    • http://dewudirana.epizy.com/maths_worksheets_for_nursery_students.pdf
    • https://s3.amazonaws.com/mufukep/what_makes_p_type_semiconductor_with_example.pdf
    • https://s3.amazonaws.com/xixonu/fabobefexoziwojima.pdf
    • http://durunorutap.epizy.com/tifediwesewapik.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_off0000e80f.bin
416d2dc1195cb9243277319c90464efe30174dd92f230cadc96d564db4ca5104		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5264 bytes
font_01_sfnt_off0000f9e9.bin
b16418777207ccebbff61b2b8c1bf4afe1956ce9b847896250d538189cfa443f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10744 bytes

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