Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f202e0ff9db183…

MALICIOUS

PDF

74.9 KB Created: 2021-05-24 04:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 91a8e31c2c34a328e99aafe0fe6915bd SHA-1: b28ea2c12e979770316b204c90b30539270063a8 SHA-256: b5f202e0ff9db183a7f23214fa8bf4bd1539867f0469461cb51de4ad5be9a966
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. High-severity heuristics indicate the presence of an SEO redirector link disguised as a game achievement guide, pointing to the URL https://dugedepap.ru/strik?utm_term=steamworld+dig+2+achievement+guide. This suggests the document's primary purpose is to trick users into visiting a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/strik?utm_term=steamworld+dig+2+achievement+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414336/normal_5fd7c17be6206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6022e5aa352fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fc8cf2cd854e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_605daf704172d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_6008f7992497f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5ff2d7047d539.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/f45c0954-38cb-4dc3-a976-632f55684e82/forrester_predictive_analytics_and_machine_learning_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383abe28-35f2-443f-926a-7068d4fde8be/sezenoverejofazomowubanoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4091664a-745f-4a4d-a641-1cca5fcb44de/gekejitereriwenekufaxapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5f9e89-d203-4a42-b432-dbd7ad5044f9/why_my_toro_lawn_mower_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d902e4-9a60-4caf-a2de-5a48b94247b3/93090130814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d99432d-f952-4d65-9378-8d17d91d5236/44695674479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec26dfc-7c92-4cdd-8eb0-2f70570bd74b/big_ideas_math_integrated_mathematics_1_chapter_3_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8573360-a352-4621-9f52-95d0ffad6fa8/fimegixomamijaxexavuvose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ae4eef-cb35-499d-9fa5-6e4fe0090bc3/fikujizitaxigav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8230e79f-f41b-4479-b3d4-6ad168e37897/what_is_transitive_and_intransitive_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485d9d2a-2adb-4e7d-90e5-fdd0518eab9d/free_florida_residential_lease_agreement_form_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7dad760-7a78-4637-ae24-de7c402466ab/99612697953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5e5da5-70e2-4b72-9d26-b3f7f1415b91/how_can_i_get_an_avon_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591894fa-f7d7-486e-8019-496ab90af129/how_to_use_magic_mouse_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c460d52-9be6-4128-8abf-cebccbda8fcd/20123775416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0537a1-d51c-4e6d-9ca8-f545017b2ad0/hey_little_ant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53fcd5c-e5d8-4f51-88c5-3568673f43b6/teponewinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce14001c-424d-46b2-9c6c-1709fc5417a7/haruki_murakami_norwegian_wood_audiobook.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5560 bytes
SHA-256: b8f741193207b787ebcec0e6bbbeec07c6fa1cf6e7d6251226b27fb622b7e2b4
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10552 bytes
SHA-256: 08fbaeb3c9a382a6e0ceb60f8227f04ed83a3d531b9e100740534410487bedac