Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a61624e009bf174…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 00:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c4741b90f75e5fb37781955eaac2795 SHA-1: 2c66171bcd44c909b17dcf379e0676d69decbd53 SHA-256: 9a61624e009bf174434b6648aaa36787fad860b6b6833c863937ced9880a28e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The PDF structure and the presence of embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=los+mejores+juegos+para+android+con+mejores+graficos PDF link annotation
    • https://hoalavender.net/upload/files/44531559839.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/10180247619.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/53221122590.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/19771300899.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/82181892065.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/43444614612.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/79429343587.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/viberosavejoxeru.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/vifumimijuvitivabutonutag.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/tetobados.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/18226547200.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/1316808809.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/lirowisusubanirewinovubuz.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/10564053386.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/83515040185.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/notulewiliwiwupudotiz.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/netigekox.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/rikuzeliwonova.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/pivamidofemalaxiv.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/48680430551.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/53300619233.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_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 18844 bytes
SHA-256: c406c4721cdcbddef3d7793922112136dbc2c028a4798316cf6e29458acdef66
font_02_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 11008 bytes
SHA-256: a66ab8be870744f4122ec99d33e96bf746194ec8f0c3afca773d1c5bba822fd8

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