Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd9a92a8f52495b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 19:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 04230543a218ff74ba499f87f7ac3423 SHA-1: 5dfdc8736eeb1d0bcc7df34e85e5a328fd629de8 SHA-256: 6bd9a92a8f52495b8e65b40b3da7c1743ed4c65b165b2fd0f22da418e985bc14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, strongly suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier output confirm its malicious nature, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=muro+do+classic+rock PDF link annotation
    • http://elma-itc.ru/!upload/files/zenitaj.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xufibakupug.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/26381008814.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bomidisusujed.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/rebeju.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/450619343.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/boruzivivanezutiw.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/xagap.pdfIn PDF document text
    • http://teraval.cz/res/file/72007646661.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/80310914295.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/14045872682.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/89297682817.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1f1tblcjcg0s4k1qk1i5i0hv8q/88061251494.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qp6252p70hm079q5llsqncisj6/maxoxosopibudoxewin.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/57887330915.pdfIn PDF document text
    • http://congluc.com/upload/files/67780278013.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/1060409156.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/rijusosapofoju.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/ginirezutata.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/81839194108.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/fugulo.pdfIn PDF document text
    • http://mebco.ru/images/file/5491148878.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/19426357110.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/23345979499.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/vavuwogamegagizapezefume.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/madovodasobuwupatodota.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/36138118151.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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10212 bytes
SHA-256: f3d8fdae3bc0d87a7831c53018cee6a91206fbd9a9cd547ef01bb083fce994a1
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 20108 bytes
SHA-256: 34daa09a9616b2c3c532103466c9eae5a8000bc090ed461915910f70c435a3ba
font_02_sfnt_off00012f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1