Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee48521d72e062f…

MALICIOUS

PDF

83.6 KB Created: 2021-03-25 12:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b286a02734e6435f54487e6b499e0e SHA-1: 8caf3f9a0df290a9b98b5e3ccc139eb26dca95c1 SHA-256: 8ee48521d72e062f9da026b8833c83f5dc3e9ec163bdff710279f166f9d07efb
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with numerous URLs pointing to PDF files hosted on various platforms. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of these links, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely acting as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=de+que+lado+sale+el+sol+en+estados+unidos
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/6643970.pdf
    • https://cdn-cms.f-static.net/uploads/4417046/normal_603458a32a303.pdf
    • https://ximusufupes.weebly.com/uploads/1/3/4/4/134486044/66223.pdf
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/1657136.pdf
    • http://kieverts.xyz/ebook_reader_app_free_for_pcabfvz.pdf
    • https://cdn-cms.f-static.net/uploads/4369160/normal_6056dd010a325.pdf
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/3674953.pdf
    • https://cdn-cms.f-static.net/uploads/4487906/normal_603a8cf8b3e5f.pdf
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5fdd9b505b69c.pdf
    • http://renawozalor.iblogger.org/tiwajuresujevefewumigin.pdf
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5ffdb5819c194.pdf
    • http://kolizeji.22web.org/86731472924.pdf
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/372c84544cb94e1.pdf
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/7f93909.pdf
    • https://liwuvena.weebly.com/uploads/1/3/1/3/131398027/xudakoz_merawunilez_pelevowi_vekulij.pdf
    • http://converstarget.ru/vasuzikaketedamisqkq0o.pdf
    • http://xufededubumavif.scienceontheweb.net/benzenoid_and_non_benzenoid_aromatic_compounds.pdf
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/wikitamatalarezufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://litorow.myartsonline.com/banking_and_financial_awareness_2020.pdf
    • http://muvekalufisu.atwebpages.com/53086968735.pdf
    • http://sosukaf.epizy.com/easy_english_sentences_for_beginners.pdf
    • http://mefugoniwiw.epizy.com/netgear_ac1600_wireless_modem_router_d6400_manual.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_off00010b64.bin
e549400fbc8cc91624a1ceb81bc32d0a4c5fbf573bf74b5810e7fa3a04fef71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 4848 bytes
font_01_sfnt_off00011bf5.bin
ef132b6e448bce0bac5255584d988da1d3446061afbdcfc6bc48ad20e3271267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 11240 bytes

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