Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f9b90789b64e7f…

MALICIOUS

PDF

74.4 KB Created: 2021-03-24 05:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d689f7282bcbaa98fccbe7971e0b6b26 SHA-1: 4c0e2d9be44a0630015b87cb4d2a9b13d1c3a162 SHA-256: 02f9b90789b64e7fb4b09f300cf810a0e5b347d52006d68bec8b1bec842318e7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'New Yorker fiction guidelines' and 'wkhtmltopdf', which are likely decoys.

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://lozipotod.ru/123?utm_term=new+yorker+fiction+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393181/normal_6031aded01bf5.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/dudisuno.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/sitavopeno.pdfIn PDF document text
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/fogaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_602f41c9afb80.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/2ed1a3d0-8f28-4282-8ab3-323806de606f/7964547596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf3a8a4-8b44-4b68-b1ac-0ca14f01e9c0/78104078251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b3119e-6503-40b4-bef8-a7441e22de85/95237310159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2f5172-75c9-463c-8726-cedc64689a49/singing_for_dummies_audio_cd_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec395fc3-c882-4ce6-81d3-eaf80700024d/80313055488.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_59ccdc9cea204be9a8b53a29ab1f5280.pdf?index=trueIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_3644f6b408564f0bbd2f43fb77644099.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c7d606-c7d4-4306-b036-02c165d2d1b5/social_learning_theories_in_educational_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c04f35-e4c5-4f84-af71-2bb2040c750d/fallout_4_dlc_review_ign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5ad7ad-1a22-4c1a-a4c1-bbb46ec2e779/jototodaduwiwone.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/shaheed_bhagat_singh_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/how_to_install_hp_3050_printer_on_windows_10.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_d01eab7b52fc4b76ac4bf99ab8569f8a.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_a3f7d8b6cbed4972806c1ae028685f57.pdf?index=trueIn 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_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 5208 bytes
SHA-256: 28a1078c2e81ddd133d11cb235cbd6dd01cc4114250aaa9d2d565c1f4cdfff0b
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 10984 bytes
SHA-256: 5cf470e5f4b2059f5ac5cf6cdd1c82afb7dacd79021af4b177d61697bd0e50bb