Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43459932b968896…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 10:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e40ef84b128cf3c8c700b0b28415d4ab SHA-1: 661d6414f87ef1ac6c1a27e49df2fd496af0043b SHA-256: f43459932b96889657366e7ccf4bcadb83f13b243a597dd1d6ef8e212e005e59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous external URLs, many of which are linked to a link farm on disposable hosting, suggesting a distribution mechanism for malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=grand+summoners+mod+apk+latest PDF link annotation
    • https://workinhotel.com/upload/fckfile/94013553382.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/xitasirofu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/15938481029.pdfIn PDF document text
    • http://jfe.hk/userfiles/42573520487.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/99635311436.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/72948605098.pdfIn PDF document text
    • http://jaqalsports.com/files/file/29289869287.pdfIn PDF document text
    • http://chinazzjx.com/d/files/49553179461.pdfIn PDF document text
    • http://apothepharma.com/upload/files/duvexifoxixinufif.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/57979289854.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/97637895562.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/sigiketevoxezibevuto.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/xusirepebabevevamaj.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/jasapogis.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/jatubobixawawexega.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210912_A4E83CECEFD5320E.pdfIn PDF document text
    • http://idroter.org/userfiles/files/27872383334.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xuwosufepejibavap.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50110851283.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/jemodedisezibepuvozovunu.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/zimenixez.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/neporugagobedavu.pdfIn PDF document text
    • https://gangnampools.com/contents/files/66477447031.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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 18052 bytes
SHA-256: 0cccc34567c9d9f6d71bb153c9bd0a60955f2a5e93608797587bd120a0b427d8
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10692 bytes
SHA-256: ac3444b43d5953eff2f3e06788ceda1da399fb7cef743eed8da4a3631325c1bd

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