Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cdfa2011c36991…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 20:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a8309161f6d1055844d0c15257654a7 SHA-1: 72ee2ce629fddb19e70800d36edf8eff5fc04d84 SHA-256: 44cdfa2011c369916caf897babdab291b21649d1a202cc000887207d3eb2bf88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to PDFs hosted on potentially disposable domains, suggesting a link farm or redirection scheme. One URL specifically mentions 'download game gangstar vegas mod', indicating a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://curtain.jinware.com/upload/files/luxerobitipudik.pdf In PDF document text
    • https://tckontrola.hr/files/nabupikanudatolejezifan.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/zeratolapemarunetajurir.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/soluguriwixebasonopo.pdfIn PDF document text
    • http://husplaza.hu/editor_up/2964808525.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/lalorupubi.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/mazogameposidobal.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/76652804273.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/negevazel.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/80643718642.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210921192836.pdfIn PDF document text
    • http://mqskin.com/luutru/files/89603603656.pdfIn PDF document text
    • http://chenruichem.com/upload/files/peponuzukozobebuvumes.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/81453021628.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/1847712357.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/jupifilanugepolini.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/97261088680.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/21748067817.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/6488294050.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/53839528374.pdfIn PDF document text
    • http://netart.hu/userfiles/file/nevaneworonuvimuzawefur.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd02db3671---sozodurudufowadasere.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/81310004671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+game+gangstar+vegas+modPDF link annotation
    • https://mediaget.com/userfiles/files/4332311245.pdfIn PDF document text
    • 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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 17992 bytes
SHA-256: fee363fbe2cb926b85ef77a8c817793359736fb8d77ab9c61daf1597d050dcaf
font_01_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10652 bytes
SHA-256: e00dbc251500c0e6f5b3e8864151c4989f4b8c172c531b54de852f54e7e1eab6