Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd8e38cd0866aa0…

MALICIOUS

PDF

73.4 KB Created: 2020-11-24 07:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0415c7361d46104852b8cc006fb5bb9f SHA-1: 1e188746f326c78481a564719a1f78265678175d SHA-256: 2dd8e38cd0866aa0f61ae9af1190e200f953681f4f7fe0d4afb3d8c0bb2416da
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to a site that appears to be related to SEO traffic generation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful 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://traffset.ru/aws?utm_term=nhs+birth+plan+template
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fa995ff434db.pdf
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f932042467e1.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f87f1f5c8855.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f93e6e252daa.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/mopulixopibegazip.pdf
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fa844b2eef99.pdf
    • https://ruwelijowabol.weebly.com/uploads/1/3/4/3/134307429/sazeresuzalul.pdf
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5f977152a069d.pdf
    • https://cdn-cms.f-static.net/uploads/4489844/normal_5fad9dde45a1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nalifij/antiviral_agents_classification.pdf
    • https://s3.amazonaws.com/xanebavifamopez/seoul_metro_map_2018.pdf
    • https://s3.amazonaws.com/fosagoba/91559062091.pdf
    • https://s3.amazonaws.com/nuxomigo/58700711769.pdf
    • https://s3.amazonaws.com/salade/pregnancy_how_sweet_it_is_game_answer_key.pdf
    • https://s3.amazonaws.com/jeromopelurab/94051438613.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_off0000e400.bin
89fbc5e4e9c4ee07b34aa691512398d56e068335073f061ebfa38d1dff4d136b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 5168 bytes
font_01_sfnt_off0000f564.bin
2764088524e9b4ea0bf81fa99ce0ed555794410cf91273a150a9cf03dc32e887
pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10464 bytes