Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8741ab1ee69594a…

MALICIOUS

PDF

77.1 KB Created: 2021-05-18 16:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 64c43bc3d34f31fc34df014021dd7f71 SHA-1: b9647ee5e8e22351122f4307157a6bd34397c09b SHA-256: c8741ab1ee69594aae5f7acf03e9cbf1039d65ccc44fa6b79e4095c2e0d3b7df
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, specifically 'https://dafemum.ru/strik?utm_term=how+to+hack+in+apex+legends+free'. The document body, though partially corrupted, contains text related to 'how to hack in apex legends free', suggesting a lure. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=how+to+hack+in+apex+legends+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382770/normal_602ebfb230f33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5fdf9995eb26a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_602ad3010db28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422893/normal_5fdd3e7731cde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376358/normal_5fc8f0986783f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461201/normal_5ffef0389bfbb.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/56769bbe-3eea-4ef6-a2ee-41c4e6fa762f/xoxemeboxebuferenojukub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f1059b-4cbc-48aa-b9b2-e5b2c102bd84/78792776347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18054545-6ec6-4714-9f10-b8d557319a02/40983482774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee0c4b8-8b50-4194-b7d8-90fd1e3ea1e6/vuvenozokitanawoviwode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547ed961-396f-484c-9307-0fae6c2d71b6/91627740367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdcec90-8859-4110-a426-16da8f74076e/what_is_a_diverse_learning_community_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b35f5e1-1b88-4738-8580-ac29ff5c9925/4247337495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdc59a9-5a46-4647-94c3-fb82b4bd2c6d/gefone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a27f7fd-3d86-4e30-91b6-864f96499640/59851778030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779fcbfa-bc3f-42d4-847f-e92fb5fe14fe/the_art_of_acting_stella_adler_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b3c0fc-bd3c-44e3-a582-8afafb7a8ec8/95105497283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64fcade-3f86-4f99-88be-ca7ad29c9797/full_logarithm_table.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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 5600 bytes
SHA-256: f58fbee323e3f29e68aaffe3803be9140f5cc071498aa5a4cb4887ad4b6a6994
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 17816 bytes
SHA-256: 36b03ab1cc9d737efc1de49b83f3022654286a30f15dc80a3e89eb6fb95d7ad7