Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cce557197d0f45…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 22:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 750202feb542691c2c854bbbc36d18c4 SHA-1: 2642984c0c1c4dd61f5326012a41b43b0268c21d SHA-256: a4cce557197d0f451406cd9da6dbe730b4909257625cb020203eecc5e85779d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically using a UTM term suggesting a lure for game downloads, which is a common phishing tactic. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the PDF is designed to host many links on disposable domains, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://allytemp.ru/uplcv?utm_term=vice+city+game+download+for+android PDF link annotation
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/61383683512.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16309513412947b6fed64518d0d7cf.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/97952151068.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/41240880611.pdfIn PDF document text
    • http://cpviettin.com/upload/files/gukavuzukegonuzososevalas.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-3/20210903210027554842.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/wexomataxunamafapukosan.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/37362083558.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/2253619769.pdfIn PDF document text
    • http://ed-union05.ru/files/file/dedixogopiwogovi.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ec9399d1b244f0e58463604c4910ca6/butixanajevupemofop.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/rovexa.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/65548872990.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/tufevineworawe.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131059c2b4d8---53002399856.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/jokexa.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/75339416677.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109011017411375.pdfIn PDF document text
    • http://schokofontaenen.de/idata/suriwizokefix.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/wizegatogog.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/36396236978.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/10153608684.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_off0000c1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 16312 bytes
SHA-256: 2697d0547084e7eb25ba17f705e139785fa18968db4a2641b173ca6c1546b9e3
font_02_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 10820 bytes
SHA-256: 8cd1be8c05e2f6cffa37fddd2a6a699777f7cb4fb208f029e181af1d8bab0187

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