Malicious PDF — malware analysis report

Static analysis result for SHA-256 636fe42e66994a56…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 17:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6c7dfc41d9e5b6272d5def1bda578c3 SHA-1: 9a63bb10ecd34edcc7af0017345e15da1309bb4e SHA-256: 636fe42e66994a568dc7cb896e55b62745d3186e11f2e6f3da5c65742af8cb4a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs, some of which point directly to IP addresses, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary malicious function is within the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb02b69b4---32558832629.pdf
    • http://pm-ural.com/uploads/files/tisal.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/54372734137.pdf
    • http://hkacca.com/userfiles/dajotowagajifosaladobupag.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff864d2211---jeguzigi.pdf
    • https://dovolena-jiznicechy.cz/uploads/82766876152.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f2fd1781---xebejofado.pdf
    • http://gioiacompany.net/images/upload/file/razavewikabobejeledudo.pdf
    • http://architettosbaffo.com/userfiles/files/wisoxibawab.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/26448198360.pdf
    • http://bhk-aindling.com/userfiles/files/58934468802.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090203014280554.pdf
    • https://anitt.in/ckfinder/userfiles/files/zixexuzedamama.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/xinolasutuw.pdf
    • http://peak-experience-europe.com/images/blog/file/vekurovosiruxetevugefogip.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xupufagixisiwexo.pdf
    • http://flooroverstock.com/admin/userfiles/file/xusonumijiv.pdf
    • http://fixafilm.se/userfiles/file/kovosadujojiwobaketo.pdf
    • http://pasaru.com/upload/files/62385943606.pdf
    • http://pathtojanna.com/userfiles/files/10439484584.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/39812125449.pdf
    • https://seo-methodes.com/userfiles/file/92213680801.pdf
    • http://www.tobywells.org/media/fckdir/file/22945111155.pdf
    • http://halongbaycruises.org/upload/files/64408133349.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=grow+old+with+you+mp3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d733.bin
cd526b5d08dea9fdcf89a8b059efaafea55182a50e62d4f79444feafa51e9a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 17596 bytes
font_01_sfnt_off000104f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 16792 bytes
font_02_sfnt_off00011d0f.bin
5cae3c664fba3e9f7b76a7d7938544db0a58859c28f52e9f9ca7cbbd7d3894db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 10604 bytes

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