Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8966a747739c0a…

MALICIOUS

PDF

70.4 KB Created: 2020-12-26 06:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f61a1d43dd292f205878fad1e03e057 SHA-1: 18a7e6e79d491d6f8ed6087889a399f7b9b93717 SHA-256: 7d8966a747739c0a1cef252fd3b5656ea1e3cd14a29595cb9b1d52a48a5254c1
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on Weebly and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=lowes+whirlpool+refrigerators+top+freezer
    • https://gimunoje.weebly.com/uploads/1/3/4/3/134344093/jinisamebiv.pdf
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/simoruboxage-zowaniw.pdf
    • https://cdn.sqhk.co/pekebugus/GNyygcI/66367926801.pdf
    • https://static.s123-cdn-static.com/uploads/4446651/normal_5fe40f80b555b.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/papozamijul.pdf
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/4391300.pdf
    • https://cdn.sqhk.co/baxemazisod/g1ghmBc/tisapaxeresewevowiduvuvo.pdf
    • https://cdn.sqhk.co/xoluxuroku/hfxahci/lucky_block_for_minecraft_1._12._2.pdf
    • https://cdn.sqhk.co/ludafojebi/gfjrjjq/fenejenopifavafonitibeg.pdf
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5f909c8d3bc14.pdf
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/fizuderoledapew-mavisilu.pdf
    • https://cdn.sqhk.co/nutakurij/idPVGhi/74781334585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d4c8.bin
9f90d426d3ccdeba6b16f199a50e31c8eea2e40de31f5d47618634deaad5e142
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 5248 bytes
font_01_sfnt_off0000e6bb.bin
aacb5be40390811dffa432b1f2dd10320e804a7620a2a053cf30f44448b5a00a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 11188 bytes