Malicious PDF — malware analysis report

Static analysis result for SHA-256 105b8348aa38c3a9…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 04:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 098cc907568da2135809c91594ca33a0 SHA-1: 802ce3a7cbd172fdb23b96e14e15cbbe1efa71e5 SHA-256: 105b8348aa38c3a9703e69b2a508d9a5f10c4f487abe5a9260b677477e44f779
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing infrastructure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out the use of disposable hosting and link farms, reinforcing the phishing or malicious redirection hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=how+do+i+change+font+on+my+phone PDF link annotation
    • https://alev.az/userfiles/file/9351870693.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/88275425993.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/20965921630.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/guzawepapobixaj.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/92686382684.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/roxowusuboxexabid.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/47083620870.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusol.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/debudenupezaliwuvetelom.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/zazul.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/11390318572.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/13624613114.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/96153019435.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/87259796135.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb655e1b5---fixisinabaravoto.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/vukaral.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210909232856.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/50838495714.pdfIn PDF document text
    • http://119pump.net/d/files/39362600080.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/jiwugusesu.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_off0000aa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA67 14828 bytes
SHA-256: c55db6172a9b4780f8e062b26d8a27ac4e829abaeb556d0738b469f06a447473
font_01_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 10944 bytes
SHA-256: 09000f781456aa7fd2b6dc97aa2561a37d6b58cffe64470042a8c7db2b46a6cb

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