Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05aaa6ea8e2af76…

MALICIOUS

PDF

80.0 KB Created: 2021-06-06 09:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d15ebe2dc1e6cadbcf30ac100f38c86 SHA-1: c2201c27e0df334ec3bcf5f790adea448b1388de SHA-256: c05aaa6ea8e2af7699ede2b50e9c61e8ee906b9f21d9dff956e48aaee2b3c673
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted files, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=how+to+type+an+invisible+character+mac
    • https://leguwilevifemat.weebly.com/uploads/1/3/4/5/134595517/6b5f40.pdf
    • https://moniraje.weebly.com/uploads/1/3/1/4/131438162/zekekif.pdf
    • https://zunatiwol.weebly.com/uploads/1/3/0/8/130815351/b62ef14.pdf
    • https://sokezimipadivob.weebly.com/uploads/1/3/5/9/135959039/9df956.pdf
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/7283005.pdf
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/e121ba86cb20.pdf
    • https://moxudula.weebly.com/uploads/1/3/4/8/134884970/pukaberusogonu.pdf
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/9d32b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f820df26-62ae-45bc-a0d4-435cec119dbf/determining_volume_of_joined_rectangular_prisms_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/d1dc26ae-18e5-4d1a-adeb-60264505e0f9/fisitetunutimiwub.pdf
    • https://uploads.strikinglycdn.com/files/37d72217-26d0-49da-99f8-166c4c64c594/71768511905.pdf
    • https://uploads.strikinglycdn.com/files/730a90e8-8750-45f1-b3b8-337761b3f0ef/jufugavubakexokaf.pdf
    • https://uploads.strikinglycdn.com/files/77e32627-0bed-4eae-b46e-388f77bc0ea4/34766155770.pdf
    • https://uploads.strikinglycdn.com/files/c5d809f1-852e-4977-93cd-35197fdce28e/nudasepijadomilosura.pdf
    • https://uploads.strikinglycdn.com/files/8da7237e-05e7-452a-a4e5-e0fe863dc78c/ludisigidadivaziro.pdf
    • https://uploads.strikinglycdn.com/files/9bd82df9-1f0c-4a19-8261-80d592c48b78/bepexirowejopefom.pdf
    • https://uploads.strikinglycdn.com/files/578e7a0a-ed3c-439f-a8ce-f41bdf849039/sunforce_led_solar_motion_activated_security_light.pdf
    • https://uploads.strikinglycdn.com/files/80c60786-a045-4c98-854d-97c9258a65b7/2015_maserati_granturismo_mc_centennial_edition_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/edbcefdd-6a7d-484f-ba25-76471cf464a3/zufotofefedotuko.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f11f.bin
7801db1516543494aed194fb4834aad6ca7b549f15737690db3a10468e267358		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF11F 13128 bytes
font_00_sfnt_off0000de67.bin
0798355acc798ca83fe81b54fed5228e094b66b90288133517ddbc25274b5e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 5528 bytes
font_02_sfnt_off00011c8b.bin
0c82561ead172ac0e51412abe629b5944d5f81f469066018c017fef234fe4ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 16388 bytes

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