Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b59718fd390cbf1…

MALICIOUS

PDF

80.1 KB Created: 2021-10-12 17:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3121384b8528410431923ff389c2ed64 SHA-1: 4ec5ce8bf3b19fb1e375fe034b1a4efcd89d94f2 SHA-256: 8b59718fd390cbf1830570d1b7b14c4b1cd2ab643d430a5b22f92ca73c5244fc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The 'SE_CALLBACK_LURE' heuristic confirms the document's purpose is to trick users into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to host or link to malicious content, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://elperrocallejero.info/ckfinder/files/96433077474.pdf In PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/72420469479.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43431046234.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pesefijonemutizigopo.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/44190810574.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/gubozimav.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bivukinux.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/33530345058.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9978695d---kagaresumokebuwe.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/h04bnvrj5emvn3j2j4b08n3e0h/21429031558.pdfIn PDF document text
    • http://orlickachata.cz/files/files/wuwenibemalobu.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/bibukuzowibofebox.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/voturetowe.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/ximijefexen.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/mekevabepis.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/kizapamupojili.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/zudewijilajuzifixivixo.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58651894105.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/94474936346.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/17901030616.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/suxozusotopajofapesunosex.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/71829814936.pdfIn PDF document text
    • http://z500.si/files/lowifiweredogefaxiruk.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/xiludipefovevi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/60347898712.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=a+is+the+subset+of+bPDF link annotation
    • 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 17628 bytes
SHA-256: d1b2359391b1338682820f4400bda5859832fea9a3612d647651ab1eb693634f
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 10120 bytes
SHA-256: b6850bc46d19d4173cb16647cfbf63602d524f95dccf0ab80d4289d0525c6b6f