Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64be68e7d42bb55…

MALICIOUS

PDF

78.5 KB Created: 2021-02-23 11:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 90e3bdc301a663323e9a10a501619379 SHA-1: fb1dc77fb660780bbb335487850bb8e54ae04ad5 SHA-256: d64be68e7d42bb550663cc426fcccc3d8b0be9341fb5609ad759a74208b277c1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a multimeter, possibly a lure for a scam.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+use+a+craftsman+82345+multimeter In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420248/normal_5feff9c744f31.pdfIn PDF document text
    • http://najitop.22web.org/rugemuposowukot.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/jhbiaie/counter_strike_terrorist_online_game.pdfIn PDF document text
    • http://mumavanetadasos.22web.org/57610578031.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/gucci_sneakers_size_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_600b25f7d850f.pdfIn PDF document text
    • http://paxebuli.iblogger.org/www_nacte_admission_guide_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/Hhyhjb1/belozuzisasebizebuwedam.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/SPdgdIn/siberian_cat_price_in_usa.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/zikojoredo.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/VGJRjjI/street_chaser_game_download_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovisak/acls_pretest_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/38269920690.pdfIn PDF document text
    • http://jaxilikujo.rf.gd/c_t_studd_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/67076701261.pdfIn PDF document text
    • http://nakunefizuvodu.epizy.com/1742610115.pdfIn PDF document text
    • http://wafubarig.epizy.com/autumn_spring_movie.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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 5780 bytes
SHA-256: ee2b371abbc5b203488500ea8fca4bd20b97b826be4ccd83184efa516c05a291
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 12180 bytes
SHA-256: 154b0127cc004cfbb4ff5cb71a8dfa4657e3d1206ffa05e8c8bb9b60f34cb0fa

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