Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ba18572a027774…

MALICIOUS

PDF

76.9 KB Created: 2020-12-31 08:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a294a89b3a68a277bd34b5b2a795d80b SHA-1: 5a8b200fd3784a5d78fbc18f18d5a9bd0f303661 SHA-256: a6ba18572a0277746d57ffcfd6b610e444832196834a66a17bf2421f28a96fc9
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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
  • 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://traffmen.ru/123?utm_term=animal+crossing+new+leaf+eyes+guide
    • https://cdn.sqhk.co/zenetofuma/089hbsL/space_invaders_arcade1up_mod.pdf
    • https://cdn.sqhk.co/sirejeforox/hfMhchj/ike_countdown_to_d_day_movie_trailer.pdf
    • https://cdn.sqhk.co/tovisegag/Rm5iejh/super_slow_motion_s8_plus.pdf
    • https://cdn.sqhk.co/jogepirar/hazHzNG/xuborilibodivinudekuxawef.pdf
    • https://cdn.sqhk.co/rodesedaded/EfhgePs/wefesuzirizojugop.pdf
    • https://cdn.sqhk.co/jawutuwek/javggdV/download_superhero_war_robot_fight_city_action_rpg.pdf
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/zirukulepo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4f3cfe61-7474-4682-bc27-7a97e2e8cf56/worulopibutit.pdf
    • https://uploads.strikinglycdn.com/files/87c9fcf7-a626-47f8-ada9-6cae76589ac6/mawugagemedubajowenepiva.pdf
    • https://s3.amazonaws.com/lixisariwulo/nuvot.pdf
    • https://uploads.strikinglycdn.com/files/56ad8a34-96db-4280-8364-0953aa212e65/adobe_premiere_pro_cs3_shortcut_keys.pdf
    • https://uploads.strikinglycdn.com/files/8a3645e5-efb3-4434-bf6e-83960014a3d7/parte_lquida_do_estiercol_crucigram.pdf
    • https://uploads.strikinglycdn.com/files/0b45e036-0fdc-4707-a761-13713d3c420c/the_new_interpreters_study_bible.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29d.bin
3b16d153fa2964ca894385b1930ebf8789e9653b47e18915237ca56f44df5274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 5324 bytes
font_01_sfnt_off0000f495.bin
47f2988a67e5794c4e47b7a58c7ba62786a5c8b033b55251721a6087faed8df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10720 bytes
font_02_sfnt_off000118d7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 4324 bytes

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