Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51e6708f65e82c3…

MALICIOUS

PDF

67.5 KB Created: 2021-02-15 23:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a872286bb5773d6e46353f0a5325f74 SHA-1: 94303c5eaa48d81076a76d25fd37962c1b276b4c SHA-256: e51e6708f65e82c3e02efe5e52ca2fe14c0764ceaf529f6ceef6964e74a2a418
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on link farm domains, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier also indicate malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure, likely employing embedded JavaScript to facilitate redirection.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=best+books+to+learn+stock+market+trading PDF link annotation
    • https://cdn.sqhk.co/pebekaja/fbNhcih/steampunk_racing_3d_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/ZBTIVZR/download_game_fidget_spinner_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60143c9167bef.pdfIn PDF document text
    • https://cdn.sqhk.co/fitodofafe/QjeOWqn/chess_rush_meta_season_8.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/1jhgSNl/1426979917.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/togemunakawi.pdfIn PDF document text
    • https://kajagopop.weebly.com/uploads/1/3/4/7/134729443/xevisedasiba.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/4497368.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/iZgh9bq/fetemegob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_600fd6a63efb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fc760dc13398.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/Ijal8J9/52250561828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467027/normal_5fdef72d7636c.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/xamibudasagas/hp_ink_tank_415_datasheet.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_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 5512 bytes
SHA-256: ee1cb2731b138791b645713cab6d0deaa9e16244f58378791f1652a2199d7990
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 11540 bytes
SHA-256: 727c08a0d5abcc13e40cb3a5177ef954da5edc5f6b7e31ad71a07c0da261e9ef

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