Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c22d17f071e257…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 06:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a0478256438cf1a2c8bdbbac0d2e340e SHA-1: 19283fb9d8143ebe37dfda047d673a86e07da661 SHA-256: 78c22d17f071e2576bca4f80f5dcdb6893e472663f0eb5bec2ae228005158150
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. One prominent URL, 'https://fokemale.ru/wix?keyword=river+road+saddlebags+installation', is presented in a way that suggests it's a search result, likely to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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=river+road+saddlebags+installation PDF link annotation
    • http://com-connexion.xyz/92532979602am9nu.pdfIn PDF document text
    • http://pressit.space/373423668649d4c0.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/how_to_clean_ratchet_straps_by_dirt_farmer_jay.pdfIn PDF document text
    • http://roman-holidays.shop/vezupobugopamevju9b3.pdfIn PDF document text
    • http://complerbnp.com/arthdal_chronicles_episode_18_freejn07b.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/PhgkPgf/fazuve.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/9887607.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/5jfgdkh/614335600.pdfIn PDF document text
    • http://balifruit.com/samsung_dw80f600uts_aa_troubleshootingmr79n.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/J5gejdp/40942950366.pdfIn PDF document text
    • http://tuwedoviwe.iblogger.org/13867151166.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/YjaQjew/mikefazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bunizavax.rf.gd/lg_tromm_front_load_washer_error_codes.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/38310733333.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/xaperafukotekewuso.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/how_to_look_up_a_citation_number_in_texas.pdfIn PDF document text
    • http://pitefabe.epizy.com/80557546336.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 4988 bytes
SHA-256: 86f55ffa26be1caea5aa6f425094ec8d58ebdfdcbfc2b82dd461f7dcbbadd449
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 10544 bytes
SHA-256: 6258c8a31fc85d07aa30ed7182873c1ee12f9683e2a955a71ea355d950fa4de3
font_02_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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