Malicious PDF — malware analysis report

Static analysis result for SHA-256 37572e6e0ef65d17…

MALICIOUS

PDF

73.2 KB Created: 2021-03-02 15:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 79abdb70c40a4cd4eeceb03e7fec886b SHA-1: 60606a1849fc662491ebb61cd3fdaa82973e0bc9 SHA-256: 37572e6e0ef65d17aa134a73cca40ad6222ce378d71581a85593be19fa307bab
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to 'lawn boy f engine rebuild kit', suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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
  • 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=lawn+boy+f+engine+rebuild+kit In PDF document text
    • https://cdn.sqhk.co/wibononuve/DgjTtha/36334036235.pdfIn PDF document text
    • http://sukukotomi.22web.org/fuxuxusenoke.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/mjc57ii/37866914273.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/gjLghaP/6065495125.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/zjfXSie/22587739512.pdfIn PDF document text
    • http://debegezuvume.iblogger.org/lenomeviwekinosidetil.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/how_to_turn_on_power_wheels_dune_racer.pdfIn PDF document text
    • http://liropade.22web.org/81973746060.pdfIn PDF document text
    • http://lulikike.iblogger.org/95585839804.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/iihdQdb/tamigalagod.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jcl2bhb/41177563803.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefezaw.rf.gd/answerphone_song_free.pdfIn PDF document text
    • http://bakenexiradofo.epizy.com/nonstop_balls_hack_apk.pdfIn PDF document text
    • http://tafisazovelowu.rf.gd/carl_sagan_contact_book.pdfIn PDF document text
    • http://desasivitusuzux.epizy.com/96761508609.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_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 5236 bytes
SHA-256: 611cc07a7cbcedcf754c77d53d372ee09a73a4b67b5c87374bf31eae75fbdd2a
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10000 bytes
SHA-256: 81c870ab49515ec577e91e3a237251dfd9f5d34e63080ed2ddad564192dc1327

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