Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31096cb60a0b180…

MALICIOUS

PDF

68.2 KB Created: 2020-11-18 12:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5251957bee5ac0d8f7518d1a4cd1a42c SHA-1: 2c1092aadae036c87039926e1664ea65fed1d710 SHA-256: a31096cb60a0b18042503527f3027c1136ddf7d079da8a6cbb3855a5c05acb02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The primary malicious URL identified is 'https://trafffi.ru/strik?utm_term=ikea+sultan+luroy', which likely leads to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=ikea+sultan+luroy
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/jewedo.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/ce08f2bd9.pdf
    • https://zipalusub.weebly.com/uploads/1/3/4/3/134343211/zijusaximaki_tuxoxosapuxer_wugegifegazad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gifiz/zubatunewawidoko.pdf
    • https://s3.amazonaws.com/fenatagazise/nujeve.pdf
    • https://uploads.strikinglycdn.com/files/0f779404-cb5f-459c-8dbb-70c0e448a5e4/83326019375.pdf
    • https://uploads.strikinglycdn.com/files/1c894623-df5d-4e46-929b-c1da7f2f7fd4/76470934609.pdf
    • https://uploads.strikinglycdn.com/files/4486e58f-2265-4cbb-a2b9-829d72a061f8/nerupus.pdf
    • https://uploads.strikinglycdn.com/files/ff4d4102-2b39-42d9-b2d6-6f728fa05568/white_wings_paper_airplanes.pdf
    • https://uploads.strikinglycdn.com/files/6fd5a4b9-1b31-48ec-9ccd-3d069b05a3a3/umich_hockey_schedule_2020.pdf
    • https://uploads.strikinglycdn.com/files/1fc1e0a1-be7a-4c7f-8e02-9c74da4b6c67/what_if_its_us_book_characters.pdf
    • https://uploads.strikinglycdn.com/files/394e2efd-22c6-4b28-a5e3-31a4eefebfd6/schauer_battery_charger_jac2036h_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee7.bin
6a065902129c9b47c6e3e998815bfa20559f12915f381b91d1975b99bf64c908
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 4784 bytes
font_01_sfnt_off0000df42.bin
9986f226ce5493ef1f65026a1861a38ddc32b8340460aa8e5188d57c3a784a3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 10796 bytes