Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe771c22a995264…

MALICIOUS

PDF

85.7 KB Created: 2021-01-24 11:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c913e2d88e02397ad7beee291a8eafb SHA-1: b1ef8bce7fac3a03eca5b11766e2d55a7ccf3aa5 SHA-256: efe771c22a995264bcd23a1ea7d8d2bb7368137d6f6e0eda1f304161c506cc08
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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.
  • 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://bologen.ru/aws?utm_term=bleomycin+injection+venous+malformation PDF link annotation
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/48308bbfa.pdfIn PDF document text
    • https://fagedudadisex.weebly.com/uploads/1/3/0/8/130874641/famabikejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fd614f4beebe.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/jejomesinepepa.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/vagilefapezimevisu.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/ggfigUg/little_big_snake_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rotowan/53066424202.pdfIn PDF document text
    • http://firabano.epizy.com/nupowamosivavel.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/dirumodavapi.pdfIn PDF document text
    • http://tuwelifijija.rf.gd/fidelity_certification_of_trust.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/cassis_de_dijon_case.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/15277575027.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/mapping_industrialization_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/impossible_year_panic_piano_sheet_music.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 5196 bytes
SHA-256: 6da6dd10621cb26b36627bbba2ef82d81ce8a6475e6a92e10a5c6a4ce7a3268b
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10384 bytes
SHA-256: 870e9d6444a1286a919556c8b2f1fe6e1d9e887b00a28b21b941e42a14db0915
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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