Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a377e32538934c…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 04:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e244b86bd8b650749f365bda31db1f39 SHA-1: 4032dc827223f2a7847f237db96c02d570e5704b SHA-256: d5a377e32538934ce82ca9fd46559e511da83606381741a38a59bc20531ac35d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing attacks, designed to trick users into clicking external links. The heuristic 'PDF_IMAGE_LURE' and the presence of numerous external URLs, including one pointing to 'infrive.ru', strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=my+gp+apk+latest+version+download PDF link annotation
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/nezubujebivufut.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/21837279456.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/85028048312.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/gorazux.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/75008584534.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca869ae10a---zarimerupefodevezupog.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/34619866097.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/sozesediwipagopiril.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210911095316_416812240.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/85855100999.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/22869115430.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/ridofof.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/46955356227.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/newepesoropet.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/vurufijolowezazepore.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/93048612729.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/65271498359.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/58587348923.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/4305463179.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/kozukoxudeduvane.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///bekik.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/73539328235.pdfIn PDF document text
    • http://whatdwellswithin.com/file/68701608004.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_off0000ac12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC12 14488 bytes
SHA-256: 7da64f8230ea17d25511d15ef933d1d156da2a620ce6ba8aead474c84fea3e02
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 10916 bytes
SHA-256: dc79eb3fa26be3f6090b0333d3b822f4c27920fac9949ac0c8a1e3b174bb7654

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