Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc12097ceff4b43c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 13:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83587c4f5910736519c25383466696af SHA-1: 8558f2b5acb2c7be6e7642c442a5c4f7da37c867 SHA-256: bc12097ceff4b43c8607470dfbe55b7dab08bccef574b878c9dffb34d1d7c4aa
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. A high-severity heuristic indicates the document attempts to lure the user into executing commands via the clipboard, a common tactic for initial payload execution. While no scripts were directly extracted, the PDF structure and heuristics suggest it is designed to exploit vulnerabilities or trick the user into running malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://videoeffect.ir/data/file/tipuworajeribaxib.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449bbfe6129---nuxowazagekasut.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/9828954325.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/gifefidaxakotukosazeli.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/dorog.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/77655109660.pdfIn PDF document text
    • https://baptistfriends.org/media/zarazerozegilesiviwo.pdfIn PDF document text
    • http://caythuocnam.org/images/files/vutaxoxinugufedategoxuv.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/girasikite.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/vobituvugijufopizotirafi.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/63443997695.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/pusosapixega.pdfIn PDF document text
    • http://szhlfz.net/upload/73594644139.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/62269802193.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/74301409081.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e07c2d03e48be2c2ea3a53ab4379a9ea/68145318816.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/31766093747.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/1109199145.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/mufezixowawemej.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/neratefesemedep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=transferir+contactos+android+iphonePDF link annotation
    • 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_off0000bab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB7 20280 bytes
SHA-256: f253ba3f9f3e23463d2fd4288964b7e4fedf0c279dd9e341ab595ca25023cf18
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 10636 bytes
SHA-256: d15def16872e56a2e48a1e55219679bc5eefeb7d3a4948d1cfb54375356765c7

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