Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f07d4ee83243ee…

MALICIOUS

PDF

70.9 KB Created: 2021-09-21 07:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1684953f004591f43c7bc854e6e641d1 SHA-1: dda6a55697f7adae6e9fabc6dee60d0dc75f2faf SHA-256: c4f07d4ee83243ee56c9ba09c082eee72fa04220f86d01ccb6dc36f83eaa0d04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kencert.vn/uploads/image/files/kunejumezusanabamugawozes.pdf In PDF document text
    • https://hoakhanh.vn/uploads/image/files/48495039212.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wapadozumovu.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/69866934769.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/35407595719.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zoxaxowuladapute.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/bonaloselimalusuno.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/bekarija.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/91369002137.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/suporamijonutefodez.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/40116368790.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e86252a8c---73361667187.pdfIn PDF document text
    • https://egf.tw/test2/images/file/79500255004.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/tesasararuj.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/70624373283.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/pewowitezopujomezukape.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/6467172853.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/4412973709.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/wotojaxelube.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/sisubuxoroluvozebojex.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/kofoxafumewoloradifaguk.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/45621897541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+akan+doctrine+of+god+pdfPDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 10740 bytes
SHA-256: 2b1f694604310af762a6dbe42639381620325da8db7ca5271f6ed109930b63c8
font_01_sfnt_off0000cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC02 16372 bytes
SHA-256: a1d3a1f585bdbe7fdd90da2e0905d0f3be11914f443e43cffd7dfa6335e5e0bc
font_02_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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