Malicious PDF — malware analysis report

Static analysis result for SHA-256 03320243717e8dbd…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 19:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8fb3ca36f3a3b0de8778fac181a35f56 SHA-1: bd3a9fa5bf990e06439dd56b56b79817e63f1fdf SHA-256: 03320243717e8dbd4bb45888255dbc918ac1caaf798dfb4e9a77da69cf98affc
166 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of 'LOLBin token sequence in document text' and PDF-specific heuristics further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://www.verneteco.com/ckfinder/userfiles/files/86210754954.pdf In PDF document text
    • http://escrima-rlp.de/userfiles/file/kasafagowuzugodawonutigej.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vapefagezapewagefu.pdfIn PDF document text
    • https://webhosting4.net/media/file/pojipagivapikawati.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/nipepidofosukajowudemalu.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/65230403995.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/5461011903.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/52847762917.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319639790e3---nulifokogave.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/kikalasetaparejejatixibi.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/58344650669.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/19702593516.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/92680382784.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/42411775566.pdfIn PDF document text
    • https://melz-feu.ru/upload/kutelemujalujolejo.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/35472773887.pdfIn PDF document text
    • http://atomleasing.ru/media/File/40881475478.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/3916580224.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/97266405433.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/89449180567.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/76635858091.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0c2drb76v1i28qfqghpk63pce6/vajoxowerikuwi.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/kasixuzakinanigiv.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/59382728837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+old+do+bearded+dragons+livePDF 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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 10608 bytes
SHA-256: e1f9c23fbb627be5c4a053aa428e852d3de800d8cf662addbe053e7b7fafae6f
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 15716 bytes
SHA-256: 873107f9f42d70588d581845cc107c191e123d048891ec8b9c8a236252417b62