Malicious PDF — malware analysis report

Static analysis result for SHA-256 853f4b82cc8ed9bf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 01:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a294fd23b5bc851e0901f91501ae27b5 SHA-1: 0de1e8c04cde1328b7b8834b1d0873fc8e1d5076 SHA-256: 853f4b82cc8ed9bf4104cd6eeae22507d539c710d2e6bec444077f4d726d16c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of multiple PDF-related heuristics further supports its classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=damon+ps2+android+apk PDF link annotation
    • https://coffotea.com/uploads/files/202109170544474411.pdfIn PDF document text
    • http://fteq.ru/files/file/binonowavefuk.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210913221921.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/fewuzo.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jutoxoxebarorimisodu.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/livaxetomo.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/tuvijapufuboge.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/20963739809.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/88584348018.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912224420.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf47da1f0---wilurasokulujusap.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dixepanirim.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/rufadole.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/842901856.pdfIn PDF document text
    • http://datcat.vn/2018/file/barunotuvexof.pdfIn PDF document text
    • http://petrduchek.com/files/57503061588.pdfIn PDF document text
    • http://vodova51-53.cz/files/8723536958.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/86291627574.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/mepilomefimubuganonofeb.pdfIn PDF document text
    • https://thepainter.asia/upload/files/jodeketatozazar.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401ffdb80fa---gosukowa.pdfIn PDF document text
    • http://pk.mo/userfiles/file/95467128161.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/tupolipezakalixuwigeboxun.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_off0000b8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B7 10492 bytes
SHA-256: 1f8654557d516a0d268ea6c8898aa33957424a84ace03526c6f857ecc5dc4831
font_01_sfnt_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 15964 bytes
SHA-256: ccc6168de897a9736cf1ffbb275719e631b2197204d47c27a9e587f082d44c12

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