Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5222bf4c984601…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 12:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 005b5540837c60d20ee1bdaa61276db8 SHA-1: 26e007db67f8fda48dd8006d5c18b212fd28a8b6 SHA-256: ec5222bf4c98460162e3a69403197e882787d79c96686208cbf599f31d7273ed
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm and a phishing lure, with one heuristic specifically flagging it as a callback phishing attempt. The presence of a raw IP address in a URI and numerous links to disposable domains further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://thaoduocquyhiem.com/userfiles/image/file/woduwidemi.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/lemalataso.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/vozajafivoveto.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/88805734058.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/54142332982.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/28846785486.pdfPDF link annotation
    • http://cukrarnakolbaba.eu/obrazky/files/lotedugoma.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tiloduja.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/22461140233.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/wefir.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kirabemogamezoge.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gijuxu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/31536327968.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090201010273499.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/93364665326.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/46867629353.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/91731801979.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/18291995984.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/80198328269.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/duzerupapimaf.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330f1119358---mesibobukasofoxudimefula.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/30905062698.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/64374320141.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/61521180946.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5675f0159---tewodotuno.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/90099506661.pdfIn PDF document text
    • https://cecprint.com/images/file/kuzupipoban.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=call+of+duty+unblockedPDF 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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 17588 bytes
SHA-256: fcdb06ac5fba7fb64b2e34aca8e760ab48675baa3b508fe23658c863033db2c8
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 10588 bytes
SHA-256: 338a6369ae6bb825718ab8815a0adff038c6d787cd8592a1b182c4f052a41244