Malicious PDF — malware analysis report

Static analysis result for SHA-256 47045f13744bcc36…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 15:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e50a267d22636edab0e71162cf82677 SHA-1: 2cba4d6ecb82ca0d63d5df4fb811c75a69649565 SHA-256: 47045f13744bcc3605771eaa1e91350b987ac9b7ccd66c9b607b0ed4ff2794f1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The presence of external URIs and a link farm structure suggests the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=rules+of+survival+vng PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161413c029aeff---rasipeduje.pdfPDF link annotation
    • http://strelnicebudejovice.cz/userfiles/file/70435330340.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/13417501973.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/95087296652.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/42389922920.pdfIn PDF document text
    • http://meskerjager.nl/media/files/gujube.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/molonixof.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079584ea1e---6966699637.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zexugisevawubovezun.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/73053788188.pdfIn PDF document text
    • http://helix.chuing.net/mai/ckfile/files/golesufiraxopawawejigovef.pdfIn PDF document text
    • https://lecachet.fr/docs/files/dakik.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00e7bcbcf---77612693701.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/14403999395.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/satewi.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/wetonowofunuwidejozax.pdfIn PDF document text
    • http://savemaxint.com/files/file/tebonuwulis.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/xizimijidunina.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/73833552427.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/jifaxajumagona.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/66072352427.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210918170504.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/34074601969.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/mijupepasavato.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/xazidewobidux.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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 10500 bytes
SHA-256: 5bf0167a183b507b192f6c376993f358a6244a40e21e67d33d7f128f37dcc2fe
font_01_sfnt_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 15044 bytes
SHA-256: f8fc81b09c08bb167618bd0daf2e33fe7b8bcba64b601180c98e18757ccfd77e