Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a5a718e7e388f6…

MALICIOUS

PDF

78.6 KB Created: 2021-04-12 04:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcb231aac02a03f15d29dbce2d8e04c8 SHA-1: 2174bd0c6b46d6eab4e5489c73e0acbd57e20b5d SHA-256: 40a5a718e7e388f61c2f673b13a426e6c24e784ac2f2b3ac40ec8280d9f8a0a2
186 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 a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=best+self+love+books+for+young+adults PDF link annotation
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/2404980.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/9509278.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/3982335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_60200bcecbaca.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/nakosef-talowedomav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_605c09a3367f1.pdfIn PDF document text
    • http://pshcomonhere.xyz/what_day_do_navy_advancement_results_come_out2nhm6.pdfIn PDF document text
    • https://lemuvizavo.weebly.com/uploads/1/3/2/6/132682731/navepunejunej-xukowibiw-nezebol.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/fefebitaju.pdfIn PDF document text
    • https://bazanepuxakelu.weebly.com/uploads/1/3/4/3/134346533/3859035.pdfIn PDF document text
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/tunirod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_6042c11abb49f.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/napubanowemebutudif.pdfIn PDF document text
    • https://kimulidorifuvup.weebly.com/uploads/1/3/4/8/134856260/37b12c0e4a0.pdfIn PDF document text
    • http://ottics.ru/3460362940p44hw.pdfIn PDF document text
    • http://zoo-taxi.site/54165989105f131p.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/b78eeb77-0c44-4cb1-ba05-81573f691b0e/19877064228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c110aed-6906-41ee-baeb-88a2144f2ed6/68481329255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574505a3-6d24-4d73-9597-70421a94b25d/center_point_scope_3-12x44_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951803ea-c518-4923-8a40-7bbd5a4a298f/what_is_the_plot_of_maze_runner_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839b8bda-eb39-4c0c-8990-05ca1e1afdb9/gokosowus.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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 5488 bytes
SHA-256: 7aaf59b534d728c82c11027e23c45262cb7302ccc22358bc476016c9b1340a4f
font_01_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 10884 bytes
SHA-256: 8fd70753d515ba8bf96a8ae7b8bdecd1285a8f67790836b4c52cd608a57b18a4