Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908c5609d7929da…

MALICIOUS

PDF

75.3 KB Created: 2021-03-02 04:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 34643fa3816750dce81c35525e26a298 SHA-1: bfe4c2d8f06b4898d1804391affe5bc50adb239e SHA-256: 5908c5609d7929dab19640ffd4a2645643f82b5fd66a248d6595dba33a253979
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

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://zajinet.ru/strik?utm_term=how+to+determine+age+of+state+water+heater PDF link annotation
    • http://onlinetiser.website/challan_no_280_formatu6cpu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5fdf318168339.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/hiAnibe/45395449076.pdfIn PDF document text
    • https://buzazimuz.weebly.com/uploads/1/3/2/3/132302772/bogamokidolev_bimowoju_zajaze.pdfIn PDF document text
    • http://wssummer.space/18825219210ykajg.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/smart_calling_art_sobczak_free_download.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/gigefopubi.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/hhjjiaq/why_d_the_chicken_cross_the_road_meme.pdfIn PDF document text
    • http://you-bestshop.xyz/hp_deskjet_2540_not_printing_colorp75e7.pdfIn PDF document text
    • http://groby-ritual.online/9859654231wfbl8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_60133de070957.pdfIn PDF document text
    • http://top-shop-store.website/pepobalwjxss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/dyson_ball_animal_2_upright_vacuum_in_iron_purple_reviews.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/88098577182.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/briggs_and_stratton_5550_watt_generator.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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5340 bytes
SHA-256: 9af7ad88d2d1fe4923a9a37273315b1b59ea755b734faf4e16e1d94b71702ae7
font_01_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10968 bytes
SHA-256: 4fd0a28d57ef09c736a6e8aa45eccd489a525f0e041d946b485a03ebbdde2796

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