Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c49ef04397ad281…

MALICIOUS

PDF

62.3 KB Created: 2021-02-25 03:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 03d698123a8a95f34819602bfe5f326e SHA-1: 6b887c66337593657252565b13d7eba2f90880c9 SHA-256: 2c49ef04397ad2810b6a433d2b920f7de5788bdf287c2459bc2f5a4a9da0538b
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are flagged as part of a link farm. The primary URL, https://jacksth.ru/award?keyword=what+is+process+description+in+technical+writing, is presented as a technical writing resource but is likely a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9564

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/award?keyword=what+is+process+description+in+technical+writing PDF link annotation
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/5fe9a86ebdfb.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/39fe2bae0.pdfIn PDF document text
    • http://sberpodarok2020.online/43865513694pwrud.pdfIn PDF document text
    • http://prizinsta24.space/allpowers_solar_charger_10000mahdtqtc.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/idxgjjj/27052901947.pdfIn PDF document text
    • http://tesar-krd.ru/quran_english_transliterationu229y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasaxotudulolo.epizy.com/intermittent_fasting_tagalog_guide.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/mevuju.pdfIn PDF document text
    • http://lebasasasob.epizy.com/how_to_use_helix_lt.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/super_easy_crochet_hat_patterns_for_beginners.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/ragivarigajuvokovan.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/nasowemesu.pdfIn PDF document text
    • http://mivogunav.rf.gd/15949256070.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 5440 bytes
SHA-256: 504f824d0266aaf75f9c56df732c70cb2e55a5bb51e83f6f5a80a3abbdeafb78

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