Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08ab2c61f105ad1…

MALICIOUS

PDF

67.7 KB Created: 2021-10-04 07:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ae97677f67874d5b3d4a624a413abe16 SHA-1: 666dec59d46b4169eff43c5bfd96e561ec4e939e SHA-256: f08ab2c61f105ad19eb736703896666cd8e906124fa839d6ee9cc30d30299e61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://inwebjor.ru/uplcv?utm_term=25+mbps+meaning PDF link annotation
    • http://ecoaga.com/documentos/file/rokuzogubawutagowute.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/34165352284.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/70220628803.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904035349.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/fidodunerilomo.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/4139946042.pdfIn PDF document text
    • https://banghenails.com/upload/file/lovotodoriwavobiw.pdfIn PDF document text
    • http://cx-gl.hu/images/files/vezixemixenapomimobi.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/pisilikamaz.pdfIn PDF document text
    • https://askflip.com/uploads/files/11812041280.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dixepanirim.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/vipikonebevumifulugusuka.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/wugulodefuvafu.pdfIn PDF document text
    • https://linker.tw/files/sivibowojafokikokor.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/273757644.pdfIn PDF document text
    • https://gilbertems.com/videos/file/96354089336.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/7179139868.pdfIn PDF document text
    • http://armanetti.com/images/2566488505.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/tanogewixofoxuvuxaxizol.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/jibadunulowive.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/vemugexudo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/43a10facea02048887f6544bb3e8d61e/dopoxogoxamal.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gokefixox.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_off0000acc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC7 10528 bytes
SHA-256: ea1a62d74a1bbb75e93ac0032b483723fd7a516ecc68205433bd70bfb3e541aa
font_01_sfnt_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 14948 bytes
SHA-256: f020bce5fb9290225f3f43f2c3e845d5885bd0695522972e3484f149210457f5
font_02_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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