Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e2f5f829e688f4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6ccbf88598a0915c5ea6ccfc954edcd SHA-1: e22f710401dc09863f35e92efbf110196624f3df SHA-256: 54e2f5f829e688f44e4fd1357889324381c4ed5873b9edcb59d7da13a1d0dfa5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

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://coretry.ru/uplcv?utm_term=apps+similar+to+zinitevi PDF link annotation
    • https://glycocalyx.nl/userfiles/image/file/63139498671.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/finefeduw.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/kikaremo.pdfIn PDF document text
    • http://mobitransjogja.com/files/dawakutikexigizor.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25022366327.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/82990064212.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/vulelejiriwuteradapebope.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/65090473553.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/56506756105.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/ronugunej.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/96621569720.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/larigapinukaguwasaginida.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/zawekugonopagurovokukew.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbd39a62a---kidema.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/44929922503.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/pesaxosuworofezomejadure.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/95523003758.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47d3f1e45---6836908648.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/88593203770.pdfIn PDF document text
    • http://chromoink.com/updates/file/35670259713.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061028257055.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/67356310327.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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 17804 bytes
SHA-256: 6b9620eb22633b67a8748bb458f16c6509455bebb4af79ad9c9b47c675d6aab7
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 10520 bytes
SHA-256: 086412e00f193e14fe41fffd59c2e51147d844dba61d7bdc91c96ec7976d01e1
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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