Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd16820e9dcf3407…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 02:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e3cee0cd3a14126dac85289f2f1ea22 SHA-1: 8f47c65ae6e58cfe688d95420a80fbc8ecee37c4 SHA-256: dd16820e9dcf34072ed80a9cf688242a7d1367ece376b7bb608e3ffd358b257f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to download and execute a second-stage payload or redirect the user to a phishing site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=wcc2+apk+latest+version
    • http://alconsprom.ru/ckfinder/userfiles/files/gigapaporogegoj.pdf
    • https://szekszardportal.hu/userfiles/file/nopakaravimosafuledadosav.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910b0b0d6b---53796703042.pdf
    • https://angkalaris.com/contents/files/nutigaluvobavo.pdf
    • http://cartopack.be/Images/file/22065100948.pdf
    • http://tienhasteel.com/app/webroot/upload/files/74646879698.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/nugenedomavet.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xisatapokekikolur.pdf
    • http://ceskylakros.cz/userfiles/file/75315511740.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/41739353848.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/fozuvelilepedaxemobitepeg.pdf
    • https://guclupin.com/calisma2/files/uploads/34227963661.pdf
    • https://worldmedglobal.com/userfiles/files/ludulisufimijanej.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/38009218469.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416b9221b8b---83805241069.pdf
    • https://tecnomatec.cl/upload/file/63824091853.pdf
    • http://school19-zav.ru/userfiles/file/lugomewaxidamiwevesusix.pdf
    • https://yukkumpulgroup2.com/contents/files/jusudubopedasix.pdf
    • http://neza.cz/UserFiles/File/moworuvepitu.pdf
    • http://maurovalleferroarchitetto.eu/userfiles/files/nuleruw.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/kuxipokiwawukirixani.pdf
    • http://belly.bpv.su/content/files/files/62646812683.pdf
    • https://icrs-as.com/userfiles/file/nideganadez.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/xuxasejudefag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28e.bin
991eb2df862cc1f9ca57fd4599e6452c3ee4fcfc6e946e9ac93c4ee764f04bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 18416 bytes
font_01_sfnt_off000112c0.bin
85ff78edb6c0fe92be0234a68d3722b4d0a0de8af55305c1ba765da782e2223d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 10636 bytes
font_02_sfnt_off00012b59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 16792 bytes

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