Malicious PDF — malware analysis report

Static analysis result for SHA-256 35feffc059274001…

MALICIOUS

PDF

81.2 KB Created: 2021-04-08 14:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 25e03d1d05effe84b03a726de6a724ea SHA-1: e258f25570c88db7a6df0e2544a444075f9ae92d SHA-256: 35feffc0592740017f77897ed77d9983b03ef495c6ac3428d77645f691f8eb3c
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 pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The primary URL, https://jumiwimov.ru/strik, is likely the final destination for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=midland+wr-100+desktop+weather+alert+radio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5fca966522586.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/2006_chevy_malibu_v6_starter_replacement1stk4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463529/normal_5ffbc2379a557.pdfIn PDF document text
    • http://pet-guru.shop/battery_care_function_windows_7s69sb.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/mabekebefep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_6040de83221cc.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/bd33d6e107e3.pdfIn PDF document text
    • http://meetporte.xyz/norcold_fridge_broken_hinge5o51y.pdfIn PDF document text
    • http://reduslim-ordina.site/behringer_pmp2000d_manual02laf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472188/normal_6007ab5478020.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/f68bf6cc-5ffb-401b-9880-de8cc265e59c/20316239203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b3659b-705d-4091-a2b6-e97404348a5b/87755780928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3461bea7-f0a0-4515-acbc-930382a4d2b0/dosuburorete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3986b8b5-d6f9-433f-ac75-e62cc26e9dc1/39188153276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395ad189-38ea-44ac-a139-d6488ceaed19/in_the_heights_movie_casting_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852e76ae-5c1c-4830-98b0-fb67a1eb5a83/how_much_should_i_charge_for_online_english_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670516c6-5512-4803-8c22-8fc128fca44c/where_the_wild_things_are_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc8d3ac-0292-434e-9cf4-b8e923d8323e/jekolosopazizejizapiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fcdcd0-90e7-4781-9b3c-bf055ab22f6d/how_to_set_up_xr2_remote_to_tv.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_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 5436 bytes
SHA-256: e5b1804076bcdc781281feb9ad4fa7ddf3211c3ad0af984875a6ccbd9d7db9be
font_01_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 11084 bytes
SHA-256: 4361eff0be267a84cae8fc4758593470d5d0c0382de1bb6d79084fa6f65960b0