Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde952fa0095b4e8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 07:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 754b61d0e3dc402035fdaa74507307d5 SHA-1: b5bf72a4969a3c7860945dd274f1fb962d8102eb SHA-256: bde952fa0095b4e897ebb73034778908bc7fcc20f2db478a4ca4f1d625113316
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or credential harvesting attempt. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security. Additionally, a 'Callback phishing phone lure' heuristic suggests a potential social engineering attempt to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=web+365+sign+in PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16130124e7b5ee---zivuwezenesator.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905063142.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/55824314499.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/73635397194.pdfIn PDF document text
    • https://tsegypt.com/file/45579272220.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/gunogawowukakikofujoret.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/59514361401.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/18321228552.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090917364438.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/32335061297.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426423849cc---74957025644.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/pojunijitetiluto.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/92951591095.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/gezubododowitegovufajutij.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/82187623284.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/nadikakaniwutenominasozib.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210916021303_x4yhae.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/6544436203.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kuwexamemalunob.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mixipemovoruv.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/kisepudetusuzafo.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/75819903775.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/redonidivaluwuwugoxinodov.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/28148759514.pdfIn PDF document text
    • http://one9five.com/userfiles/files/zojufowomexazotawilop.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_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 18808 bytes
SHA-256: 8ed76fa4a768ea540dd8f0b4ae9dfc0a264e7fbba62646130a487fa0fcfcbef4
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10364 bytes
SHA-256: d02e066ce2bb35609224391fa14271814e5e659c0dba48ecf646861ad493e7f7
font_02_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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