Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7c0792602c34ff…

MALICIOUS

PDF

67.5 KB Created: 2020-11-28 18:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b8123996bfaa265eba72fd84e6d4b8f7 SHA-1: 538b1eff7381607b1e2f44d2e43513ee051e2cf0 SHA-256: 3b7c0792602c34ff065ed35993ab65a2473f64eec1676d4ef22979756f7d47f9
186 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 6

  • 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.
  • 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://traffking.ru/123?utm_term=what+are+the+negative+effects+of+land+clearing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5fb6d69ea0659.pdfIn PDF document text
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/1e091.pdfIn PDF document text
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/b5954a8a9624e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_5fbf2bb828003.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/timitusiv_vunema_tibozuvedumita.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/migifirugolojos.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/jazikipipu_pudaxujopor_jodexetiwetap_ninegirel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b845cd-fe5f-4d9d-b254-a81e7244078b/harbor_breeze_replacement_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8855a933-df96-4f81-a0a1-66c7e2ee8643/ragtime_gal_rap.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/daily_language_review_answers_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f8f826-214f-443e-9ddc-ca446443a3b6/pirate_bay_proxies_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143a8cf2-0767-4295-96f0-cf45760e62ad/intune_doterra_ingredients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31922782-af1b-4336-ac8c-7a3ffa54fb5b/wagapunafide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 5356 bytes
SHA-256: f3be3ecd60e3b9040c39327bd7b83934cc7ace071784b87b1fab84882b334df6
font_01_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 9524 bytes
SHA-256: d79a8db5daf321b878842b8fd92891cc642e189d40f20e68e8a059831b36c909

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