Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c3796081acd775…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 02:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67514c980332292837a9be852f0fe268 SHA-1: 2d37690cdf25c13db6740abb3c1667e4c268a000 SHA-256: c2c3796081acd775a0788fe97674f2d99f41051375ca991904838f0c5146bcfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous external links, many pointing to disposable hosting, and one prominent URL suggests a lure for downloading a game. This indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=the+gun+game+download+for+pc PDF link annotation
    • https://grootformaatspandoeken.nl/userfiles/file/69069514605.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tewukomobudagorujososutab.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/4148567445.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/24580953689.pdfIn PDF document text
    • http://hkwwta.org/userfiles/98754249139.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161395fce54194---58946883465.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/kasivasanarobetipukiwip.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369fd30d2f2---wimosisunuk.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/jozebajogavukiboj.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/mebafojimaxuruwerir.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/98336173023.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091210230551.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/94044270447.pdfIn PDF document text
    • https://cet.sk/res/file/besirisiwizoxafunokoduli.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/xekitubasamuzejuwiko.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/resen.pdfIn PDF document text
    • http://freeorden.com/media/file/gokodam.pdfIn PDF document text
    • https://zzwgjx.com/d/files/pitadexivirepazenoxiju.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/42051416117.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/82370360142.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/xitapaze.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210920191121318.pdfIn PDF document text
    • https://bfull.ru/uploads/files/38211443700.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/sujifabewot.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/2104175836.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_off0000b685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 19124 bytes
SHA-256: ddd86de67a5afb922aa0437c5294d8cb131abb6001c153dea514622616fcc7e7
font_02_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 10860 bytes
SHA-256: 1c45de3eaa9d975040f9efbd426e2c61428ae5f4ef488bc7697a9fd9a6c22ada