Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a24dc74a746b33c…

MALICIOUS

PDF

78.2 KB Created: 2021-03-19 23:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 43abe82070636b968f1a95a2dd04a89c SHA-1: 6df6b246065f7aad6b3fd61beede1602ce64a498 SHA-256: 1a24dc74a746b33c6b4278fcfd20323f44eb447c0a240b1b4e589ff41d173c96
224 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The document body, though heavily obfuscated, appears to contain text related to 'Adobe pdf protect', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence further support a malicious classification. No scripts were extracted, but the overall structure and URL indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://crophysi.ru/award?keyword=adobe+pdf+protect In PDF document text
    • https://cdn.sqhk.co/ketofebem/Qjcmhge/lutodijaruxasizizuvolo.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/gjBxPsG/kung_fu_panda_2_lord_shen_backstory.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/hahbFjg/tifovovo.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/Es1gelG/smash_ball_fitness.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/winbook_tw700_tablet_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/mihjhHn/jamefalasadex.pdfIn PDF document text
    • http://nojigopagapusu.mygamesonline.org/14941867065.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/332997a2-8d9b-4201-88d4-d3c3abc771b2/how_to_get_rid_of_alcohol_smell_in_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e051c2f-7132-4de1-ac4d-ee720d41c68c/stark_trilogy_book_4_read_online_free.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/lewevezoj.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/59028219326.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_4128ff057afa4923a972bbf0313fba2f.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_41f35e0db50046b0951610961917a63e.pdf?index=trueIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/vanumexidef.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/jutuvunenoxo.pdfIn PDF document text
    • http://zivonupawidam.atwebpages.com/epson_3640_will_not_print.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_87b359dd83d24e828392539011ffc1d9.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_8b1c020b89da4768892a20a7d44125e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad8d1d9-1702-48c9-8d26-d7a0001b9616/62576829398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f626e2b9-c07a-4faa-b449-d5b2bfb8f373/fimibirobirumevuva.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/45566521867.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_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 4860 bytes
SHA-256: 287f45a18e73a5c40bd7f6ad071f46c1bdc6c8f3b3d8acd4fe99e3ca3430b0d6
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 11144 bytes
SHA-256: 165c31475ea43c79f13aafc6599d35319b5cc3769407c1edc69ddc4f7a627245

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