Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdcbb9e10661899…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 16:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bff79cae3626a1bc20512ff1e64edd46 SHA-1: 5b2da652a13694ea0875e6c267f037690fec9862 SHA-256: abdcbb9e10661899a042997f010004688c0e5aa35117955349e7126f5a0d66ed
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'LOLBin token sequence in document text' further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crysiq.ru/uplcv?utm_term=bloxorz+2+unblocked PDF link annotation
    • http://p-energo.ru/content/file/nugaluzuxodakivaxama.pdfIn PDF document text
    • http://lex.tj/img/file/xinisebeloporozivelizev.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/95235366551.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/98230440687.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/gefewiminuvododirugem.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/45627546764.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wibesaxozebukule.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bosukobofoj.pdfIn PDF document text
    • http://aprt1day.ru/file/62578250409.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631208404_867ac5273e.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/34188506990.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/41979938717.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jewite.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/lukavegubizizopozaror.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/30664058664.pdfIn macro / runtime command snippet
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134171ec281f---7366710202.pdfIn PDF document text
    • http://net-marketing.hu/images/files/lovorodejevowosa.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/74724518138.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/todudixixereletezowavebap.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d06bbba55b4f827008ab49572c4d6783/11780709780.pdfIn PDF document text
    • https://lecachet.fr/docs/files/safux.pdfIn PDF document text
    • https://kawanmto.com/contents/files/fepopojabedibixiwufej.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/zawajavilinobebilujebaj.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/retudetolada.pdfIn PDF document text
    • http://bftt.marketsearchingIn macro / runtime command snippet
    • 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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 18060 bytes
SHA-256: 4c073e32fa99b3874791c630eaeb72a3541d26a94c40aa2d344ed9c187df4b72
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 10512 bytes
SHA-256: f07453d3ed81a718de6b76f3f5cacbb8bd7a192357839513311f029fb84af1b3