Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c92644d88a8de84…

MALICIOUS

PDF

64.9 KB Created: 2021-02-27 16:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1f834fee0407bbb71bc89e00e596e0b SHA-1: e6115477e07e5b416d43aa1c564b5bfe7301b89e SHA-256: 8c92644d88a8de84a07d31871264d7936ba97f4effddf25f5df1e73de5d6bf32
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and hosts a link farm. The embedded URL 'https://fokemale.ru/wix?keyword=kronos+4500+time+clock+setup' suggests a lure related to time clock setup. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further confirms its malicious nature. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=kronos+4500+time+clock+setup
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/vakupikafezej.pdf
    • http://bumasujofoj.getenjoyment.net/focusrite_scarlett_solo_ableton_live_lite.pdf
    • http://kakolamilasaru.medianewsonline.com/what_does_lll_mean_on_maverick_thermometer.pdf
    • https://cdn.sqhk.co/xesofosirija/jgbJ3nI/kegafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/litunux/toxuzilok.pdf
    • https://s3.amazonaws.com/mefadedosuw/kexivekov.pdf
    • http://fagufobukabovu.epizy.com/21330051568.pdf
    • https://s3.amazonaws.com/falevi/areopagitica_text.pdf
    • http://bidusibebawuz.onlinewebshop.net/what_is_the_setting_of_the_story_the_bet.pdf
    • https://s3.amazonaws.com/benuka/the_witcher_book_set_paperback.pdf
    • https://s3.amazonaws.com/mosezavor/70245601310.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_off0000c0bb.bin
d558e98d14a57e8dbc3591dc3887385dbb984fc757f2cd9d30609cac9368ce6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BB 5256 bytes
font_01_sfnt_off0000d29c.bin
705fb09733c8ab3e3612be302fe4b4c6c7c2ab948b7dd5c836809448b4836ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 10184 bytes

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