Malicious PDF — malware analysis report

Static analysis result for SHA-256 083e8377a8484174…

MALICIOUS

PDF

61.9 KB Created: 2020-12-23 14:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01a61ba3b1a8d88f41a33e15260cdca6 SHA-1: 03acd032c4ea5baf4064c62cb8427638c12f7e8f SHA-256: 083e8377a848417456f791a003a9a762cef893cfaae229198965fd0c54b02d71
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic firing. The primary malicious URL identified is 'https://trafftec.ru/aws?utm_term=equivalent+ratios+9-+2+answers'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO-based malicious redirection.

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://trafftec.ru/aws?utm_term=equivalent+ratios+9-+2+answers
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/vopezinadapubafoxi.pdf
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f90ba2da6b97.pdf
    • https://cdn-cms.f-static.net/uploads/4471688/normal_5fadb48d93e11.pdf
    • https://cdn-cms.f-static.net/uploads/4469836/normal_5fa8cc59a5bf2.pdf
    • https://galovuxo.weebly.com/uploads/1/3/4/7/134760431/wuzokisepu_zumodorijotuxi_gatoz_guxuvafo.pdf
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/jejubi-zazofegesitofom-zadal-nizavegedupum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1ed047bb-8b9c-4358-b097-e8033d91cb21/48943673735.pdf
    • https://s3.amazonaws.com/fosagoba/zevugam.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/dusimidub.pdf
    • https://s3.amazonaws.com/semuxemakaw/tufonawubawanosu.pdf
    • https://s3.amazonaws.com/fejififimaketo/fetegaluvipi.pdf
    • https://uploads.strikinglycdn.com/files/3eb93c14-c5d0-4e49-805c-5f83b57465f3/57050835520.pdf
    • https://uploads.strikinglycdn.com/files/219caee7-fa69-43a7-a98f-0b0303beb7fc/82758276163.pdf
    • https://uploads.strikinglycdn.com/files/a53be2ec-8f90-4397-8ac7-51dea6b6c342/vsco_cam_apk_download_latest_version.pdf
    • https://s3.amazonaws.com/kavitokolezub/rubuma.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_off0000b569.bin
1d59ff6937f943c1c1b26c20f2be47624607bbfe61df2a29e8429efa870e7f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB569 5236 bytes
font_01_sfnt_off0000c765.bin
d1ad5fb87716caa6cb1dcd38ff2a275f8af76123aa7ca5bfdea39df447168bb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 10276 bytes