Malicious PDF — malware analysis report

Static analysis result for SHA-256 960a1d1dbd6f5581…

MALICIOUS

PDF

89.2 KB Created: 2021-03-31 17:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87a2a7845aa8117cd6751d7551cf6a71 SHA-1: 91da19828c330e2f83cb7b40a577743779543c35 SHA-256: 960a1d1dbd6f55814c36077e6e521fcb3d3b6268f5d6f91f39fac00f6be99ffe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing attempt, as flagged by the PDF_SEO_LINK_FARM heuristic. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The document body, though heavily obfuscated, appears to be a lure related to 'Fifty Shades of Grey' to mask the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=fifty+shades+of+grey+book+synopsis
    • http://kejoxemubogese.mywebcommunity.org/cuales_son_los_tipos_de_investigacion_de_campo.pdf
    • http://zeboxagekej.sportsontheweb.net/15786216299.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_6029c82365acf.pdf
    • http://lubevos.scienceontheweb.net/zipubikiwewibukowuvugi.pdf
    • http://katipef.medianewsonline.com/timulomuni.pdf
    • https://cdn-cms.f-static.net/uploads/4486034/normal_6058da5f00e0d.pdf
    • https://static.s123-cdn-static.com/uploads/4451949/normal_5fe439a974261.pdf
    • https://cdn.sqhk.co/mobixipotex/hLLlpQh/gotojitaxum.pdf
    • https://cdn.sqhk.co/jesovolavig/ggjaibB/23677166883.pdf
    • https://cdn-cms.f-static.net/uploads/4403117/normal_605bb0b154251.pdf
    • https://cdn.sqhk.co/jokawefezo/gijc3hh/lokicraft_download_for_windows_10.pdf
    • http://tewatag.medianewsonline.com/classroom_management_plan_examples.pdf
    • https://cdn-cms.f-static.net/uploads/4446289/normal_6054f3f5a3713.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_1936833632dd482c8d6d92104faa7a20.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3a34dc31-7339-40b4-8a09-af2a1e6534d4/the_fire_next_time_chapter_1_summary.pdf
    • https://uploads.strikinglycdn.com/files/381a1bab-3531-4115-ab91-67d847ab7515/how_to_scale_measure_in.pdf
    • https://uploads.strikinglycdn.com/files/c0448699-a4dd-42d0-a5fe-7a1ed9a8c05d/nonibogezigilugizi.pdf
    • https://uploads.strikinglycdn.com/files/13824860-7f3f-4568-9c48-1e4ee1d94c7d/are_jumping_jacks_good_for_belly_fat.pdf
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_b722ab6e9e3a4989b8c861bc3732833b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9389481-f68f-4ddd-8c9e-1b099e148e33/72242592182.pdf
    • https://uploads.strikinglycdn.com/files/9712bc86-7a86-4f58-8a91-d2b63fa801e0/horton_hears_a_who_movie_google_drive.pdf
    • https://uploads.strikinglycdn.com/files/bd412e8b-a9e3-44ae-8040-3f5048ccd20c/bezef.pdf
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_429d77367d0442b2b82a55c75209b4b6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cde.bin
e4975da6f9585ffe0d42a802964ba7ada3dfa49681ac85ba99617e3f3ac49652		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDE 5532 bytes
font_01_sfnt_off00012fb3.bin
f033767e4873723610ab0bb68b1db41cdd88fe8e5014a27eedc3c9760b2ef923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 12032 bytes

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