Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ffbc6cc0258b05…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 18:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a7dace4a348be0f3464ef7a43c67916 SHA-1: 919a0a4bc39c470925f1c1dcd069555cde0e2b73 SHA-256: d9ffbc6cc0258b05b726ef7bc964e0cc510fca474d8ffc24908ba06803600748
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, with one prominent URL pointing to 'bologen.ru' and another to a Weebly-hosted PDF, suggesting a link farm or redirection scheme. The presence of embedded links and the 'SEO Link Farm' heuristic indicate an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=rom+games+unblocked
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/955ea83.pdf
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/zomuf.pdf
    • https://cdn-cms.f-static.net/uploads/4368736/normal_602aa2200c1e9.pdf
    • https://favobilumosuxo.weebly.com/uploads/1/3/4/7/134733594/kuserivevunadu.pdf
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/silemivukile.pdf
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5ffca134f399a.pdf
    • https://legukofa.weebly.com/uploads/1/3/5/3/135318177/rofizanasatunex.pdf
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/punal-bemores-mofuwu.pdf
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fed457623a28.pdf
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/9046886.pdf
    • http://doweryklkq.space/15656317435jsutg.pdf
    • http://antonioita.fun/hamilton_beach_stay_or_go_crock_pot_instructions1i6sv.pdf
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/06135.pdf
    • http://wersita.fun/renaissance_architecture_ppt_free0sbf0.pdf
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/mamamenuvu_berosaw_mepadu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sulanulug.epizy.com/consumer_report_best_worst_cars.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_off0000ef07.bin
0c1b5b5dc91a968fb8f5450990f44168da03992ca31b6f76d0aebd3a07300de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 5372 bytes
font_01_sfnt_off00010145.bin
7a7f005d20e57659651120bd7c13a7f53592b8257fe3bb289ca0e65926762821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10464 bytes

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