Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e4055da5503eaa…

MALICIOUS

PDF

76.0 KB Created: 2021-05-16 15:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 19f1e8dd6bc657cd92390348568c3ad2 SHA-1: 122318e5566c73a5af5fc5355f3ad2d3005bdeb9 SHA-256: d6e4055da5503eaa67caf1bade13203b6eba933f0253bfa39e73c7d0a7e52671
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=nutrition+facts+taco+bell+bean+burrito PDF link annotation
    • http://nupifijaw.getenjoyment.net/buderus_gb172_24_kw.pdfIn PDF document text
    • http://copyright-services-us.com/what_personality_types_get_along16w8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5fdbd3693d3a8.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/vw_customer_service_cardiff.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/hbQ0HEq/skateboard_party_3_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/2ghhgja/lulub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_605d96385f1a3.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/gafuwamepadik.pdfIn PDF document text
    • http://soldonlakewood.com/deathwatch_honour_the_chapter9iqis.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/2011_rav4_sport_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_6024052becf57.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/f9O9Bih/hp_image_editor_windows_7.pdfIn PDF document text
    • http://mjawebdesign.net/19671378660ik03t.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/pmggN95/commuter_bike_pedals.pdfIn PDF document text
    • http://carluxepaint.site/7277978030667829.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/hMgj9eQ/hola_music_stand_assembly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_601007ad66d58.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/11th_science_biology_book_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/hgQhbNK/66756142565.pdfIn PDF document text
    • https://cdn.sqhk.co/fusulelibev/jeJbKWp/78700284462.pdfIn PDF document text
    • http://rollernefrit.xyz/vafijuzoviwimoeama4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasaxunofob.atwebpages.com/sezosifusedatumij.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 4984 bytes
SHA-256: 193c8d426dc58d55c25c30487ff09678e725b56f47ea9460e94e1fc39d717ff2
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10420 bytes
SHA-256: 4a9d43349790e94c29c7eda09aa463ab01c13f9396145bbe5873d51b3c3e156c

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