Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95a298bb4eb0ec7…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 03:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b20c48c2a39f9671773643abebf8c511 SHA-1: ef4fc83cb2811581c88563275975caa35460e093 SHA-256: c95a298bb4eb0ec7ada15115264fde423838721a379310ee9bd7f34191ad0141
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a link farm designed to direct users to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's part of a broader campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=antenna+web+design+studio+tutorial+pdf
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/rekuridiraxan_fozadozulaxiw_ririfonagiw_xesazomuxam.pdf
    • https://cdn.sqhk.co/xeliwiwogivo/Nge0lja/alfred_rosenberg_memoirs.pdf
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/cb72b0f67f100.pdf
    • https://walagewujiw.weebly.com/uploads/1/3/0/9/130968979/439242.pdf
    • http://muzotom.22web.org/terrestrial_and_aquatic_ecosystem.pdf
    • https://cdn.sqhk.co/tisewesir/higjQaV/80214090775.pdf
    • https://cdn.sqhk.co/wutijiwatar/degf6A3/xuranipodubabekuletij.pdf
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5fe8e114abca3.pdf
    • https://cdn-cms.f-static.net/uploads/4448743/normal_605317d887a23.pdf
    • https://cdn-cms.f-static.net/uploads/4459469/normal_601989b407b32.pdf
    • http://peroruse.iblogger.org/typing_practice_worksheets.pdf
    • https://cdn-cms.f-static.net/uploads/4380211/normal_603b7afd29a90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ceb43396-bc8b-49b8-96ca-906068dd52a6/explode_the_code_1.pdf
    • https://uploads.strikinglycdn.com/files/1a515c5a-1bcd-4662-acbd-81ae36f504ee/todd_lammle_ccna_200-301_free.pdf
    • https://uploads.strikinglycdn.com/files/324ab401-498a-4f8a-a76a-dc65b7fb827f/how_to_set_timer_on_sharp_carousel_microwave.pdf
    • http://likijanima.epizy.com/64756214626.pdf
    • https://uploads.strikinglycdn.com/files/65deddf2-3422-4741-a014-457fce98fc02/throne_of_glass_characters_pronunciation.pdf
    • https://uploads.strikinglycdn.com/files/389b5b9a-2100-4447-b96e-ff3d43c1f823/schein_e._h._1985._organizational_culture_and_leadership._san_francisco_ca_jossey-bass.pdf
    • https://uploads.strikinglycdn.com/files/38d19ac2-e5df-4d6f-b60f-82013bf59808/jepokululumokiravi.pdf
    • https://uploads.strikinglycdn.com/files/8cba8616-00f6-40e3-8c5d-cdd53661597e/detogarusewaputuzutokun.pdf
    • https://uploads.strikinglycdn.com/files/23d72431-cbda-4e5c-a111-dfdbc056e524/beautiful_creatures_streaming_sub_indo.pdf
    • https://uploads.strikinglycdn.com/files/25d44496-b9ea-4dc0-8a59-1cd8cde17e07/nusemetipobewolidoza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d9.bin
94bc7d26449ea6a455ec6739ee6acef58b9d0767387773d7b4450101535611c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 5312 bytes
font_01_sfnt_off0000faf8.bin
71d9b0621c406fa3bb2c8b695f23fc480595f3787970ab230be2e1361bd3bb12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 10476 bytes
font_02_sfnt_off00011ebd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 4324 bytes

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