Malicious PDF — malware analysis report

Static analysis result for SHA-256 6790b8d616ce32e2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 21:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a630fddbe461c6528977db73c647624 SHA-1: 563c645438c76668128cb5abbb10d12bb5b35ab6 SHA-256: 6790b8d616ce32e28577928a8c2770dc951f7702da3c02028f0d77bff554c117
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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+to+download+tv+series+on+android+phone PDF link annotation
    • http://ain.proximeo.com/ckfinder/userfiles/files/podulopipawagowire.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/41506684528.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/91794418695.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/13083088747.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/78310112597.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/sizitasusurazedumak.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109021914478378.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/18967659990.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binukemuk.pdfIn PDF document text
    • https://ptogel1.com/contents/files/76562184067.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/43566208815.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/98269543255.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/25504423542.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/janemu.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/020630049197.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/49463751576.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105c241b42---96218441803.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/wegoluvotelevupurixa.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/nerowudirikofotiwiwepom.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5d688f92---4742504266.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/rilik.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/gukoxurutawikifej.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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10632 bytes
SHA-256: a79a280f911b72ff70c9172784a207dd2c8ec5a51363009a4b406f39edcbd086
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 17016 bytes
SHA-256: 37db44b1be7155dd86505ea90c6f738114be77ad05df248cd496426d24bf1c8d

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