Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afdb1cf82e98d44…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 19:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 652768cf8b0fa2ac3a83864a15a6d446 SHA-1: 3d5813233a7565e6baa8321ef695e2e18e41a5bb SHA-256: 7afdb1cf82e98d44664947060f7d7eb15bc2c9ae3006003c056752aaa239bf5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=android+mirroring+app+to+pc', likely serve as lures to redirect users to malicious content or phishing sites. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=android+mirroring+app+to+pc PDF link annotation
    • http://sgo-bage.com/public/files/files/kepup.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/viludajumo.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/laxusamefegi.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/99043072746.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/11685249651.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/65096146035.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/35686849184.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/91978476673.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/ninekobofemanebatekoda.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/gukazeg.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/83733001641.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/44062335912.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/fawezekuvakaku.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/45518694369.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/95269574688.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/lipetewodivewaxenuz.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/13985752667.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a624e27b---48153391232.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/wimodufufoj.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/wefozinawusidubusokaditem.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fuzizaniwim.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_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 10492 bytes
SHA-256: 1cd8d7ff2bea319772343fff675a986d26ad80c09aaf5836e850546859c533e4
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 17568 bytes
SHA-256: aba8f5d6b0f5ced8c332c9587dedaab0eff0447732535894f283bbdd908ae3fe
font_02_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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