Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3d9584dd397c3f…

MALICIOUS

PDF

83.9 KB Created: 2021-05-06 03:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0b1964a536a94e7a08e7f569cd6c67 SHA-1: 8f0bbe7d93f9bb36a9ea9ea232a70fb45c38d356 SHA-256: 2f3d9584dd397c3f427cb8144cce58bbb7005e717ab5fa6986e8801042fc2fa3
196 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to suspicious or unknown domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/strik?utm_term=honda+civic+reset+maintenance+light
    • http://com-login8.xyz/diary_of_a_wimpy_kid_wrecking_ball_read_online_freemri4a.pdf
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/6422874.pdf
    • http://dreamingdeveloper.com/what_is_my_ip_address_gateway_and_subnet_maskdd8md.pdf
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6020fc46308d4.pdf
    • https://cdn-cms.f-static.net/uploads/4482870/normal_600ef6a5a18f4.pdf
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fe0fb48cc9f7.pdf
    • http://policyhelpcenter.com/adventures_from_the_book_of_virtues_videos9zmbc.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_605ee3ac8c196.pdf
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/gebikubeji.pdf
    • https://cdn-cms.f-static.net/uploads/4420434/normal_604389e2c7637.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_85ba44a3763342f5b110c353a9905456.pdf?index=true
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_f2102ceafeb648848d67048de9eb67ba.pdf?index=true
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_1a158503a6a444f48eb71bc59d3bf382.pdf?index=true
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_9a2087f5cc7c40cbbf139e2093c861c4.pdf?index=true
    • https://s3.amazonaws.com/lorifawuvawot/85447894442.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_814614adb87b4e66b166d9dbd38ef799.pdf?index=true
    • https://s3.amazonaws.com/fajujiju/cavitron_touch.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_ad91856cabf5423b9b0462dc0a7e7d93.pdf?index=true
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_eaeadb82331b43c99f08689f96079152.pdf?index=true
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_e04f655badc24daa869c0ff0c29e0a21.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_off0001097e.bin
3e945625ae7014832d895f31369fe4c41cb4c63cf53dec3f79b61c362d009f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 5376 bytes
font_01_sfnt_off00011b99.bin
af5c8a60e9dcacfea4b2eb1490113988a25e13149262a3f4a3d3c4369a8715e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 11460 bytes

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