Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac2b124ee88ddba…

MALICIOUS

PDF

76.1 KB Created: 2021-09-10 13:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2f53cef381c7c91c8a377172e998532 SHA-1: ed3dc6d6569cbd1a6b9da72311ae47652f143b2c SHA-256: 9ac2b124ee88ddba13f0643ca98a8e843b90ebbd191db112b20b607cb308ee11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a common tactic for delivering secondary payloads or leading users to malicious content.

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://ketchas.ru/uplcv?utm_term=poker+unlimited+chips+apk PDF link annotation
    • https://unicon-msk.ru/data/files/97173966274.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9f1trai87qa3cllvvf0ii65k96/62653930300.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/30652892481.pdfIn PDF document text
    • http://yongqingtech.com/d/files/96394448630.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/muwoledugokitowu.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/goromisizagoxidatazatu.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/dudejobuwiwebisozi.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/18908053048.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109061629385604.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/tukogor.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109091155098585.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/49394522432.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/51765372310.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/repumigufilupabebolil.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/rekojozozum.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/35216406998.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmupocq9nmnkkt1b5fk4gokfe2/87945650319.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/35805154377.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/vagevijedozigov.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/zatoduxamoxuwon.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/2249722251.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109051903052895.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_off0000c0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A1 10972 bytes
SHA-256: 85cf5b386e46a6a719b3d2335316219d51e375537a89f6c1f47ea37a3b06a7c6
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 19040 bytes
SHA-256: f1a0ef49fd3dedc429ebe8a7b165732c782d2a497b0e08939ea6bad4e7f671f3

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