Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcf39046b2a0464…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 06:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3bee93d43584b035e865d8a6ee16235 SHA-1: 0fc08fa84ae96a6e32a3c7f9eac4fc6be8ac4444 SHA-256: 4fcf39046b2a0464a8c310bc68e9cb036ae99dd09df3462ac7ba868bf7da2bb4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan', and an ML classifier indicating high maliciousness. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a fraudulent number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics strongly indicate a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=custom+rom+android+lollipop PDF link annotation
    • https://rabudiagnostic.com/userfiles/files/dujuxujojoxugo.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/68102872212.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/1930335930.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68466360004.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gubipobikibarawezotu.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/49557873650.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/47017108906.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/rabivozijigugoxozari.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a05abe9a81c7c986a637d59d5f10cfa5/54069303409.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31500158483.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/42192083758.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/44404446295.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/kizikinu.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/ranus.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/66818875553.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/pojejovinanijedoxiz.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/98194538142.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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 10552 bytes
SHA-256: f7c862e80a0b44ae3ed2659b4e5b679523ecdd28396d1cbcf1ada795e765a43b
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 18996 bytes
SHA-256: 1e4bcf5d628202b11d29db0508212fc2663f92e8d6a24954df4f72d839270bd8

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