Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b0f9aea7c31f06…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 10:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4756d0ba331c6c9f128cbd9cb0679af3 SHA-1: 469549ec7259a8ad2e8814588273287cf6f83fe4 SHA-256: f7b0f9aea7c31f06a156dccc604d3eda7bcc9fa1655d8dc71645a43080c419c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic firings strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=how+to+enable+manglish+keyboard PDF link annotation
    • http://ukkies.be/userfiles/file/bewobetevu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e36037e0---98063197782.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dubewaxorinow.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/82218191692.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/84591663769.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/xufimijawabux.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/56998358366.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/35251355224.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/72934886164.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/51618472143.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/xawevuxozewivaza.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/tixumimuxivan.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613891bfd1603---jitazakofagotapugabapusin.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210908185415_4tga68.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210907002317.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/sekosokipu.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/91633605668.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/66836867740.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/21861739866.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/69230597025.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/wasidavazujanolulozuse.pdfIn PDF document text
    • https://aneri12.eu/res/file/soven.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 18888 bytes
SHA-256: 337fc6b2d015efeb91ad8538a1dda3dc906641d8520c8987b43b21d01a45d9e5
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 11120 bytes
SHA-256: e7dd48064edd360897aa13a81eff127f39478afc66815d0409a8c550a332e969

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