Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0902eaa146611bc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 15:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5986876500f9c43c37054bfa85cd30a8 SHA-1: 4959483dffed9b29d29f8a8d739ce952c3599427 SHA-256: d0902eaa146611bc831df6edc2972fdb977bb4c658c93f60915c0f04a659e2d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://goldcoil.com/uploadfiles/files/xodobakeg.pdf In PDF document text
    • https://isabellepieman.com/userfiles/file/dijawumulowuzodifi.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/72587839976.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/6824831376.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/zojigeluxurenewapepetino.pdfIn PDF document text
    • http://lovesenergy.nl/file/relexewobejibevigugofigu.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/13786015720.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/20ed9aceb81eb8b4938dfaf66cac171b/70495641217.pdfIn PDF document text
    • http://simoncaulkin.com/images/55925914870.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pozemusatevuzolabat.pdfIn PDF document text
    • https://network-italia.it/file/siloviponugexef.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/11685249651.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/75344667327.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/kifaderuxelawevakam.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/83005367851.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/wofudizizizilak.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fubesowomitoxug.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379de05f895---rexajivegusarofidaziled.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/61985084480.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/zurilaranijebojoz.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/40235549018.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210914_6EB937F6075FA691.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/81218634188.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ripozadijo.pdfIn PDF document text
    • http://belv.ru/userfiles/file/15593548379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=thop+apk+32.0PDF link annotation
    • 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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 17156 bytes
SHA-256: e0184f318fb29f6c78b9c720e9a098c294f95dd4394819a8939f6939592dee86
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 10144 bytes
SHA-256: bd9c6c93ac79bbf302457c5dfea8351c9d5193745df0db8a3986a8d062378ef4
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1