Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e2f128e230720b…

MALICIOUS

PDF

79.7 KB Created: 2020-11-10 09:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b4a295cc468a0945f119197da52fb25 SHA-1: 1f9ce1d80182a3ef0fbf29b1b0f3f198bd6d34d4 SHA-256: f7e2f128e230720bd0b30759fc3c8d827c75d7dc2299d9df3b5f66ca910d66fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious or SEO-manipulated content, aligning with phishing or malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?keyword=dark+lancer+aura+kingdom+guide
    • https://metozalolak.weebly.com/uploads/1/3/4/6/134610510/tetirem.pdf
    • https://veforolafumokiv.weebly.com/uploads/1/3/4/3/134340642/648372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/henghuili-files/32018355971.pdf
    • https://uploads.strikinglycdn.com/files/bddf1f53-f237-47a9-a43c-c5691ad71feb/solivinewisiguxufofi.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/sinupexaxatesobujokebop.pdf
    • https://s3.amazonaws.com/gidibesuxi/vata_pitta_food_combining_to_improve_health.pdf
    • https://s3.amazonaws.com/fulazelof/spyro_eternal_night_wii.pdf
    • https://s3.amazonaws.com/xajowu/10136897204.pdf
    • https://s3.amazonaws.com/kezemiradigu/52150554500.pdf
    • https://uploads.strikinglycdn.com/files/d37d68b6-3e3c-436f-9221-e9773d35fa11/fapufiridagenoxik.pdf
    • https://s3.amazonaws.com/bejideba/yuk_face_image.pdf
    • https://s3.amazonaws.com/polojuliragam/minoxote.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e430.bin
4d3257321aea554e6ced4724b69707e5ec57e4ac6255312c0cd76338f1492b76
pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 5144 bytes
font_01_sfnt_off0000f5a1.bin
d0f7cbecb563f1fde48f9b619b1845f9207a7680f62fdc4b412ad07872197617
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10984 bytes
font_02_sfnt_off00011b3e.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16060 bytes