Malicious PDF — malware analysis report

Static analysis result for SHA-256 886d7bbb72a7eb10…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 03:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cf7fcfee08f0f09fb5f1af9b3c12d02 SHA-1: 79b7e89497bc935e95a30b94bc2afbb2cd43f1e1 SHA-256: 886d7bbb72a7eb10d6554220c685bf80c11ba64086a16443fb776952b4202a3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URLs, including one pointing to 'synerhu.ru' with a 'utm_term' parameter suggesting a tracking or lure mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF acts as a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=can+i+see+who+viewed+my+instagram+video PDF link annotation
    • http://tchid.net/userfiles/file/65026862418.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/68070873028.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/19621295080.pdfIn PDF document text
    • http://misbahelmudii.org/ckfinder/userfiles/files/29968250218.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138026ad68e2---xubobupakelon.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/55844361680.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68ff06e95---petadofegegizabegipi.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/satuzig.pdfIn PDF document text
    • https://slide-bearing.com/d/files/gakoxejiwoper.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/23865203094.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/wemokurajoboxeg.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/16423604235.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090414323892.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/98337581293.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/1781434075.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/31272484762.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/goxivizelujawox.pdfIn PDF document text
    • http://profstil.az/userfiles/file/xekibajoval.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/mawubivijav.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/36538170013.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mujepuxaginalusaxa.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/kaverikovefopenevowit.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 17760 bytes
SHA-256: 929557b7b975c7aa9e5e413fa8272cf8c9f21b9d2176389552a37aa0fd1a8cf1
font_02_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 10948 bytes
SHA-256: de820ac6869d893142baae62cf960e8d9a65c974db9efe4364b38fd67d108671

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