Malicious PDF — malware analysis report

Static analysis result for SHA-256 884ffbfb67f7c57c…

MALICIOUS

PDF

124.5 KB Created: 2021-03-02 06:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 18014bb4b909a036521b1f7bac487ea8 SHA-1: 4284ff81c7fedac59c6cf755c05c79fa07739280 SHA-256: 884ffbfb67f7c57c7224bd0fdc944a033f22d5aaf98a4aabe19e114db1a7de5d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, and a heuristic identified it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://jumiwimov.ru/wix?keyword=history+alive+the+medieval+world+and+beyond+answer+key+pdf PDF link annotation
    • http://pristav.pro/veputinogofifolamiwiyio5h.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/5785304.pdfIn PDF document text
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/7260124.pdfIn PDF document text
    • http://sewonmedix.ru/23940070168gart1.pdfIn PDF document text
    • http://tokigarodam.22web.org/mcafee_antivirus_for_mac.pdfIn PDF document text
    • http://greatmasters.biz/rulejufojarotojebunetee1z6s.pdfIn PDF document text
    • http://axecheat1.xyz/dudetovafofenkr.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/8512175.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/3327512.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/hj7giic/vadojazatusivi.pdfIn PDF document text
    • http://websporizlehd.com/430024520955whq8.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/heGCw23/wiziliwitarobew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gorefoverotiw.epizy.com/tuzexaminumugoku.pdfIn PDF document text
    • http://sugizujesel.epizy.com/wobusidigipematerogufip.pdfIn PDF document text
    • http://gafazexetoraxik.epizy.com/53933741148.pdfIn PDF document text
    • http://fuzazoxavuvuw.rf.gd/how_do_you_conduct_a_community_health_needs_assessment.pdfIn PDF document text
    • http://gomaxum.rf.gd/18481269350.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/bs_datepicker_set_date_format.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001abf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF9 5700 bytes
SHA-256: 47bca50c7db6791888a11691040c9c5bf25defd0a0ef3d470bd25743f2751d73
font_01_sfnt_off0001bf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF43 10560 bytes
SHA-256: da1448c2e0bcc49e705dd36a445440307c0f31f82bc7714a6238c054b7e2f0b0

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