Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd2e3cb15f31fc5…

MALICIOUS

PDF

76.3 KB Created: 2021-01-17 04:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cd75851ab9736f345e5a30ad1e3cbed SHA-1: 2a0b4da21217507d0d8d25611e06ce69c58851bc SHA-256: 8dd2e3cb15f31fc52390438d903487901d4c19bcee7e5bf8b8609122abe1bea0
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to host phishing content. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged a link farm of external PDFs. The ML classifier and ClamAV also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=why+did+snow+laugh+when+katniss+kill+coin
    • https://cdn.sqhk.co/raninogozo/rViagcn/adderall_generic_dosage.pdf
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5ffe0e716a7fe.pdf
    • https://site-1177386.mozfiles.com/files/1177386/54988350092.pdf
    • https://static.s123-cdn-static.com/uploads/4387571/normal_5fee1550a201c.pdf
    • https://luvemolovod.weebly.com/uploads/1/3/4/3/134305721/jidedon.pdf
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/843281.pdf
    • https://cdn.sqhk.co/wazafanez/sQGh7ia/visomupusaloraj.pdf
    • https://cdn.sqhk.co/bepemuno/ihODhdw/vintage_bicycle_speedometer_installation.pdf
    • https://cdn.sqhk.co/xovatapegil/LUicihv/guluwopivevanoxivupepura.pdf
    • https://cdn.sqhk.co/bedogipaxog/ZlbOGhj/femisoziba.pdf
    • https://site-1177842.mozfiles.com/files/1177842/hobby_lobby_near_me_jobs.pdf
    • https://site-1174422.mozfiles.com/files/1174422/86200241370.pdf
    • https://cdn.sqhk.co/zidexamuwela/OF1Shi7/goddess_kiss_pilot_select_box.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nowonovege/iphoto_for_mac_10._6_8.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_off0000ecf5.bin
330f4693a55b1470343057fc67cffebc99b6044a8bd283655b50761da56670a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 5376 bytes
font_01_sfnt_off0000ff62.bin
af58f2228ff835f4cbf0ac864d1b5ec5c7573f2ae6d0e1ec8448f1dc351a86b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 10928 bytes