Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb6d423da7b2f8f…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 18:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f2e4e2de75735ca1e20812f1ff4871 SHA-1: 4414ca31e825b4f3d5c6269c6b8609013a4ebfad SHA-256: 8cb6d423da7b2f8f2d55a13e7d01969a18d2be1c26be6c5d732bce9f1ba99249
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to 'Aashiqui 2 video songs mp4 hd', which is likely a lure to attract users to click on the embedded malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=aashiqui+2+video+songs++mp4+hd
    • http://sesumuruvo.22web.org/satogorepobuxetesumu.pdf
    • https://worejefaluki.weebly.com/uploads/1/3/4/4/134456715/651194.pdf
    • http://verapubudal.22web.org/43009305105.pdf
    • https://nesujuge.weebly.com/uploads/1/3/1/4/131407687/sixapufo-toramoji.pdf
    • https://kuwesitupimanu.weebly.com/uploads/1/3/4/0/134095951/2070451.pdf
    • http://jolujunutido.iblogger.org/what_places_give_you_a_free_meal_on_your_birthday.pdf
    • https://bawekiseboluxis.weebly.com/uploads/1/3/5/3/135327810/4217586.pdf
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/dugufaliwix.pdf
    • https://babexunerasosib.weebly.com/uploads/1/3/4/6/134620176/felinejotonotij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36c399da-a80c-44c8-bdf8-ee1d737978f0.filesusr.com/ugd/738632_eb57d99bb01845a4aa61e3acdab24ff2.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_2a150523077349e09fa98cf208b82655.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_d3a60a19c9fe405593a53a6e25dec213.pdf?index=true
    • https://s3.amazonaws.com/xefejevife/he_s_a_pirate_virtual_piano_sheets.pdf
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_553a9fd9c7634905bd073d9e834118f3.pdf?index=true
    • http://werokixa.rf.gd/kateminamafejuwirupurojib.pdf
    • http://wajoran.rf.gd/87701011399.pdf
    • https://s3.amazonaws.com/tobaziw/losetevexipitovalusujadux.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd0.bin
b52687ba31bf39f2f5ddbbd3bc891c0b421cef5b09dae25a18ecfe89d3239eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5640 bytes
font_01_sfnt_off00010ef0.bin
ac82d34e246dd360f23029d4344a63e5faa311b851857d67e1b8b40bc3645b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 10696 bytes

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