Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c1bc60edc4ceb1…

MALICIOUS

PDF

69.2 KB Created: 2020-11-14 05:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 38fb278b5eb34a9abcab3dd56085aebb SHA-1: ddfc52dfc38fa887aa47ac090b7b256d67648f60 SHA-256: b9c1bc60edc4ceb1072a2311cc216a5d7c945006ce7c748e45a67908d8fefd43
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 0.9998

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://trafficel.ru/strik?utm_term=adobe+acrobat+pro+full+kat%25C4%25B1l%25C4%25B1ms%25C4%25B1z PDF link annotation
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/runemevurexuziwone.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/7101554.pdfIn PDF document text
    • https://jokatilowiwege.weebly.com/uploads/1/3/4/3/134369617/dilulugodob.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/nesabeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5fa66be37f9f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fac26e5bf0f5.pdfIn PDF document text
    • https://simejozegedofu.weebly.com/uploads/1/3/4/3/134359486/jefawovovad-sozezeruxinelax-doseluziwe-demarifofura.pdfIn PDF document text
    • https://nesiritu.weebly.com/uploads/1/3/4/6/134612540/a004434b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/eliogabalo_artaud.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/69733331057.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/wawak_sewing_supplies.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/sustainable_agriculture_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/proof_of_no_income_letter_medicaid.pdfIn PDF document text
    • https://s3.amazonaws.com/fufaragebo/nagutatazagigesamapota.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 2888 bytes
SHA-256: f5ffd33d819fef3bbaa14510ee4901058a8837130854b1a5958ee82851db0796
font_01_sfnt_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 5576 bytes
SHA-256: dead59cde2c375115dc1dbcbde0abef1e5ace75f4662e84b3551d6acf6ba0d9a
font_02_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 12200 bytes
SHA-256: 90180bf44dc4049bb1ca0760f8b986cd419cbd3ec615188070b5e75125874f11

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