Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb60384585898cf8…

MALICIOUS

PDF

91.2 KB Created: 2021-03-01 17:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a27cfcedab1538517978da8c831272 SHA-1: d242e3043e862a674c53cc567d88df157e7f7da2 SHA-256: bb60384585898cf89da84fb48b2148b99b05f8b5e921012297b4f3b0fcc3828b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=discipline+and+punishment+foucault+quotes
    • http://worameruvejaka.mywebcommunity.org/sketchup_pro_online_courses.pdf
    • https://cdn-cms.f-static.net/uploads/4454420/normal_601147528d760.pdf
    • https://cdn.sqhk.co/vesagivara/cptYKaX/duzaporuzemijuvaxomido.pdf
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/556eec1ab.pdf
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/nurorujevuw.pdf
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/jetal.pdf
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/88c3a049c.pdf
    • https://cdn-cms.f-static.net/uploads/4404528/normal_603982792c34a.pdf
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/tinuvemoxedez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ginubav.epizy.com/how_to_make_a_origami_box_with_lid_easy.pdf
    • http://vifowas.epizy.com/ashrae_duct_fitting_database.pdf
    • http://tifureboriva.epizy.com/dixuwoj.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012ee5.bin
c5649278d50a44d4c9696a8c028bb2ad757f1ec0c463eecde8d795e85536439c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12EE5 27680 bytes
font_00_sfnt_off0000f857.bin
d0ec59d571a824ac2a8901673101d65fc05005cb5fb999e28d28ec27f74a59f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 5424 bytes
font_01_sfnt_off00010aa6.bin
6923ba388704a2cb4c4b2e51512a3b6a9c5219767086c5959db001a12175d5c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 10608 bytes