Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce4632a2c1371d1…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 20:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94abdc36ee2e68d9fd9c20f6954f0a18 SHA-1: 9ec50b372d5ed0b9cc8fbf6e54067c0e82bc1cb0 SHA-256: cce4632a2c1371d1c772b65e7a28b747267612d39e5488fbe8d16f63cb9f3b58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, acting as a link farm, with one URL specifically pointing to a suspicious domain related to 'android music player'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=android+music+player+with+playlist PDF link annotation
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908060256226108.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210902091121_c2lnYWZ1bG9rb2t1.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/bixowanatasovesikavexev.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43088718068.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134228605d27---naruwijoximevoxesij.pdfIn PDF document text
    • http://punaide.com/userfiles/files/54566118909.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/83237635645.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/27526127232.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/rusujatemimejime.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/falezozoguv.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/21521793911.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/guzafuzupuvuxewo.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210902_105551.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/76912951410.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/10289073803.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/35657892872.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/93753340799.pdfIn PDF document text
    • http://erimti.com/userfiles/file/lokefitikokakilino.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/26231701560.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/bubupudisudofaki.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/kisatikoxajakatitelif.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/42841323375.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ch1vcq2fme5acn107399jo6p6l/71408592369.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 11060 bytes
SHA-256: 4f501d96d7b5e84ed04727839e05bcf63bdc2070f964341a77c86653cd651169
font_02_sfnt_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 18024 bytes
SHA-256: 89c561193c6747f336c4a74ddfdafa525a7d223745b2f98f35b4c0547a969bad

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