Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c099edb918c1c94…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 07:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22e08ab04a4129281df1845b4ae3fec1 SHA-1: ec00fadcc255ee3a7a20715d771cfc102708a693 SHA-256: 9c099edb918c1c94096cad8fe1ddaaf395ca4ea5d9787bd51608553fe161cadd
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings, along with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, suggests this PDF is used to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=download+manga+bird+apk PDF link annotation
    • http://hosungtour.com/FileData/ckfinder/files/20210901_1871C4FAB55C69D5.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/5016729393.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/85876445117.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/tezodalipudopetuf.pdfIn macro / runtime command snippet
    • http://arrhythmiaclinic.com/userfiles/file/20210904120357.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/55604755292.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210901191603.pdfIn PDF document text
    • http://mweb.cz/images/file/wixebatavozudake.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/15026732639.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/40065302502.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/78732083961.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/87457493325.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/zokigizaselifazerizegobeb.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/82806956204.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/28362312280.pdfIn PDF document text
    • http://lizhechem.com/upload/files/zeletixaxusefinedurufala.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/rokitomojirofuz.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109072123597768.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/15179698629.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/37677654423.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/70506795192.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd9b29928---bufopiwa.pdfIn PDF document text
    • https://www.pactforfamilIn 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_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 17756 bytes
SHA-256: d8cdb998f30e321e48477493ac64d075cead2bb648e0274e434a15581a8ca67b
font_02_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10656 bytes
SHA-256: 8191ec2df593dbad65dde890d4266e9d2985ae7f02b9c65843e431abe5dd34d6