Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e50fe3c4369209…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 23:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d6343d6712c59288b3891e7a08115b4 SHA-1: ec3cfe49f8fe1a3b8d88f2f2da9a05ec303423a0 SHA-256: f0e50fe3c4369209cc6863987b2578110aba6cc98a7f628298ba1b8675a4cebd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting a link farm designed to redirect users to phishing or malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=0805+resistor+size PDF link annotation
    • http://dongsimkindergarten.com/upload/files/puxodoxupadi.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/najeli.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac976f457---gitifoture.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/34535293389.pdfIn PDF document text
    • http://whatdwellswithin.com/file/38461800401.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/42738063682.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/56743723343.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bifatejuwaputanek.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/75062949979.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/vexitugokuxupusij.pdfIn PDF document text
    • https://geniodelweb.com/file/domijaguzi.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/39019572286.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210903003155_k3ae0h.pdfIn PDF document text
    • https://forumsevens.com/images/file/52747558968.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133582f719ce---27830922700.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/tuxuwuz.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/gilob.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/97452504896.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/xaresi.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/51208399029.pdfIn PDF document text
    • http://355353.ru/userfiles/file/69196516839.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/piwokekum.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/81666470318.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/75415712961.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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 18688 bytes
SHA-256: c4a26002d0d2cea665010ba9afd03af187f0610a5726ada6b1b5e93e4a667261
font_02_sfnt_off00013923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 10216 bytes
SHA-256: 00dfed44224f4ee6a7774e773c6082158f65b24542cae91622da50445332d7b9

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