Malicious PDF — malware analysis report

Static analysis result for SHA-256 872165790d4a9d81…

MALICIOUS

PDF

74.0 KB Created: 2021-03-19 18:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: adffa428e57b11f4ff994d61f60df7c5 SHA-1: b2ae253cd9138f8a00e5bfaa5b6d13eaa9f7f660 SHA-256: 872165790d4a9d8169e134ba4c7cc35414565ddc74035917d4c1dc4f2c38b81e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=free+online+journal+articles+pdf PDF link annotation
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/vevegitew.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/rizifiximexotusemiduwed.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/a438434d373bd.pdfIn PDF document text
    • http://balifruit.com/kakobolopcx6t8.pdfIn PDF document text
    • http://gouliwer.online/tu_puedes_sanar_su_vidafhh5j.pdfIn PDF document text
    • https://nolilozeto.weebly.com/uploads/1/3/5/9/135957670/tisoja.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/longman_academic_reading_series_4_answer_key.pdfIn PDF document text
    • https://runolenasugu.weebly.com/uploads/1/3/4/7/134765044/6abd7.pdfIn PDF document text
    • http://zoomita.space/rutidudizoxi1r94v.pdfIn PDF document text
    • http://kataeta.club/cheap_hot_tub_hotels_near_mea1iir.pdfIn PDF document text
    • http://katermore.ru/gevimipazafopotudelwuate.pdfIn PDF document text
    • http://getsalle.xyz/adobe_creative_cloud_2017_direct1xkko.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/52800066519.pdfIn PDF document text
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/lovonebo-jekemutawelowa-fosidekenatonot-kekufipokisok.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/0e956764-1372-427f-9239-67eeb0fb4f3a/tivubuxop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c096a8-c074-4e42-ba97-b65049b3a13e/delta_22-580_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741d3fe5-800f-46d6-b022-9c7e18b7f43c/49511052295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b404eb-b47e-4bfe-919e-97d19e3ba377/5283127050.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 5180 bytes
SHA-256: 00db9254019e2031d5070833d0b67dd327d3f7f75e3c973beaf5be51ff00bade
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 11152 bytes
SHA-256: ac5983a4f7ae691d03dd7fdb31c5c0d6a3bdc1167a8be85e93dc53abcf7f95e9

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