Malicious PDF — malware analysis report

Static analysis result for SHA-256 96efaefb043f350d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 05:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99587115a54bbb5a470400154716128c SHA-1: 3605315c2c8b7cbbb2d44f118ac2e1efcb8fa000 SHA-256: 96efaefb043f350d24c29e2481cc387875064859f81ae7c61019582f00590fef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the presence of many links on disposable hosting. No scripts were extracted, but the structure suggests a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=the+good+doctor+season+1+episode+18+full+episode PDF link annotation
    • http://brenderup.ro/mm/file/11817867799.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/71066334211.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/pataxi.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/38606215699.pdfIn PDF document text
    • http://ustunongel.com/image/files/77601903013.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/3955488050.pdfIn PDF document text
    • http://blgjad.com/upload/files/damegadetigabosezu.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/xepitor.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/robilofazotebegog.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/zudofiwidajenojo.pdfIn PDF document text
    • http://delve-cr.com/uploads/88800034036.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139467306e54---rugijekoxonak.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/pokoderude.pdfIn PDF document text
    • https://europartner2.pl/uploads/10889793092.pdfIn PDF document text
    • http://logicamail.it/draft/media/jimijutux.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71446302768.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139285295058---nevarosizimiwibizonifebof.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/vavidixomelorefu.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vemovifolusu.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/bipewidojokusivawinek.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/70188956177.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/8019915814.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/bitoporirixofe.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 18460 bytes
SHA-256: 2517c69c68d392a788eaee5a71d50466207523cbb9c42d3c295d947a5fa68a10
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 11220 bytes
SHA-256: 580bf7c29a92275b1a5a98233fccea3cc0ff7945167b2af79e12e84983c51c4d

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