Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb46dcaef2d62b6…

MALICIOUS

PDF

60.5 KB Created: 2020-12-17 19:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f526929b8d7944f9eb5f5ff0ce613d77 SHA-1: 7ed275ea8ef027b2764f940800cac20d0b341841 SHA-256: fcb46dcaef2d62b655a9a9fbf82a6ccc3ef408a25783abd55d83e0ad6399e929
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs point to suspicious domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=southeastern+middle+school+walnut+cove+nc
    • https://kulinamolusamu.weebly.com/uploads/1/3/4/2/134234583/6873545.pdf
    • https://cdn-cms.f-static.net/uploads/4469630/normal_5fb4b57ae979d.pdf
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f8a4e591d0c0.pdf
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/fugis_vugiwajaxitev.pdf
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/7e7f2da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad7d143d-3fae-4f39-9944-ddf396e6e365/tarigudepanu.pdf
    • https://s3.amazonaws.com/lorifawuvawot/79323611630.pdf
    • https://s3.amazonaws.com/juvuwaterexaf/63214907792.pdf
    • https://s3.amazonaws.com/vatakefojunib/lowes_little_giant_ladder_extreme.pdf
    • https://s3.amazonaws.com/nosepevozux/matopobuxopatifozuxonene.pdf
    • https://static1.squarespace.com/static/5fc13d0827a199023ab79d37/t/5fc3b1a23f75b16643452793/1606660518228/boss_dd_20_rehouse.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_off0000b02c.bin
3a11018aa328ae00bf5f67b2226acba69098c0c8ac71aeadd384f957ad4d341f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 5436 bytes
font_01_sfnt_off0000c28f.bin
79c6a0789891e7477480849c643ea87bde6b003ae9c863498d23b6c2b0405d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 10272 bytes