Malicious PDF — malware analysis report

Static analysis result for SHA-256 686d0c0418620fa6…

MALICIOUS

PDF

62.6 KB Created: 2020-11-11 05:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9483905bd4ca586f6387618d8d6773a8 SHA-1: d7ac9a271fd847c9c36e84dd1b7917b19bfae521 SHA-256: 686d0c0418620fa64669bbcee1888449060a0b2621fb3379dc1d8b064a27853e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures. The presence of a critical ClamAV detection and ML classifier flagging indicates malicious intent. The primary URL, https://trafffi.ru/123?keyword=pnb+rock+trapstar+turnt+popstar+download, is likely the malicious payload delivery point, disguised as a download link.

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/123?keyword=pnb+rock+trapstar+turnt+popstar+download
    • https://fupojipivub.weebly.com/uploads/1/3/4/5/134525069/wujotifizi.pdf
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/faneximotepuj.pdf
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5fa1d1cc903c0.pdf
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/2290049.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/9ae051e35bc4.pdf
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/ferewudox.pdf
    • https://lovunekigip.weebly.com/uploads/1/3/4/6/134685916/f8b61b5833.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6b167ff4-e982-471a-b3dd-827b8211848b/xukenajorikosidalupowugo.pdf
    • https://uploads.strikinglycdn.com/files/8071649c-aa3b-4b93-b637-b909ddde8497/fobabedepivegonubirupe.pdf
    • https://s3.amazonaws.com/wukara/iron_age_clothing.pdf
    • https://s3.amazonaws.com/ganubifirigevi/21st_century_scholarship_phone_number.pdf
    • https://s3.amazonaws.com/mivokozibu/the_old_woman_and_the_stone.pdf
    • https://s3.amazonaws.com/gumagabu/simib.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_off0000b916.bin
79b6b5a15ce5988c7ede26af9e924200b4f715f95ef6553883503b781f6dc5a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 5364 bytes
font_01_sfnt_off0000cb6e.bin
149b61553ea9622a3c384be542c135d5865f5756f0fd3835ee054982330de0f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 10132 bytes