Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d165a14bb105e7…

MALICIOUS

PDF

75.5 KB Created: 2021-03-17 14:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57b09e37c4825634784e573c0d9a00f0 SHA-1: 74fc5705add8cc3480d1fedb4501383324756acd SHA-256: 67d165a14bb105e795a51eea7366280e790edc1b26d12806650f1de16201b182
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 0.9999

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://crophysi.ru/wix?keyword=transverse+and+longitudinal+waves+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459468/normal_60247f512f1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5fe8f494b0a00.pdfIn PDF document text
    • https://tibaxefuxi.weebly.com/uploads/1/3/4/0/134017075/bezogu_jujuzusokilotux_metetazem.pdfIn PDF document text
    • http://blancop.xyz/why_wont_my_space_heater_stay_on1c9kx.pdfIn PDF document text
    • http://usmileofficial.site/43177643954x65zm.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/99710288461yixwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd192f9d9c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_5fd198abd1222.pdfIn PDF document text
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/litupatikefomiduv.pdfIn PDF document text
    • http://filfex.ru/what_does_newtons_third_law_of_motion_state9xevz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419832/normal_60196ab5606ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fe5f0922c6fa.pdfIn PDF document text
    • http://bcipreactivaperu.com/spectrum_reading_grade_6_answer_key_bonsaim14k7.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/fc92e740-a5d6-4382-9bdc-81109461ce62/espaa_siglo_xix_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/march_madness_bracket_template_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/9557073026.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/18563803779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc71b03-c29b-49d1-a70c-a3aabaea13c0/dark_night_novel_summary.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_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 5252 bytes
SHA-256: 2fc00d3f61e14bbb1f429a38f912ff614c81456d4585a3472f6153ccdd73e9c3
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10864 bytes
SHA-256: 582f3fbb7dbdfd96cb4a6b4a32f59de9b6f797a457eccbbd30772d5d7c85291e

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