Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8b6f846e9a35c5…

MALICIOUS

PDF

88.7 KB Created: 2020-11-24 06:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91f03e8c64d4ae94aeab5fe5c965aa61 SHA-1: 1463b6a9b6cc442357993be641eb3513a3038a19 SHA-256: 9f8b6f846e9a35c5018a2731c7c17c6e78d051af04323a2bfacc8b297de0e791
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards the document's primary function being to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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://traffnew.ru/strik?utm_term=i+will+teach+you+to+be+rich+budget
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fb6de5c0cb17.pdf
    • https://kigijizinelojuk.weebly.com/uploads/1/3/4/8/134848952/38344bb668db5.pdf
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5f95300e0db38.pdf
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/vepavef-fubuxexid-zisikanifon-zifupipup.pdf
    • https://cdn-cms.f-static.net/uploads/4488322/normal_5fb4604baf979.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5f8b002bea425.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f88c3a9a139e.pdf
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f970c49538c1.pdf
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/996214.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunupalezozerud/omega_adventure_pack_modpack.pdf
    • https://s3.amazonaws.com/zazelujeju/29591444266.pdf
    • https://uploads.strikinglycdn.com/files/e257f219-ad3e-4cbd-8658-9502c6a0c23e/the_premarital_counseling_handbook.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_004_off000139cf.bin
ea0c98ced4906f39d743a937a3a539661644a0995ec8511437684b0a4f9ec65c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139CF 18168 bytes
font_00_sfnt_off0001018d.bin
db03eac91f92748154c6f27f4d8189e3d54204d4b33b25ba0f0d075592dd2e62
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 5296 bytes
font_01_sfnt_off0001139c.bin
bb325bee811ed5b98b230e14f0a9fdfda0a9a8ea7e133188ff24487d5b4dd1e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 11080 bytes