Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c145eee47b3ad1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-02 03:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e309aaa25e6eb1ea52a75c16d535931a SHA-1: ec7eeaa43a6951ae2dc0add0f39bfbb9e9cf73e3 SHA-256: c5c145eee47b3ad1acee09c6e8ddd84bb18876431ed017322f9220028d9a6b68
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content or download further payloads. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

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 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/strik?utm_term=frigidaire+70+pint+dehumidifier+owners+manual PDF link annotation
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/vujokogituzowa.pdfIn PDF document text
    • http://rubeatyshop.xyz/vuzubojizesefirirobenej6czjn.pdfIn PDF document text
    • http://boomerangoo.site/mass_communication_living_in_a_media_world_7th_edition_chapter_1l5gls.pdfIn PDF document text
    • http://fawakosiki.22web.org/tegazemodononarofelu.pdfIn PDF document text
    • https://kinoxumore.weebly.com/uploads/1/3/4/4/134463035/6513f826bfaeeef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471690/normal_60037ac4b5f29.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/rogozubupebarudagoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5ff494d455ecb.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/sandisk_clip_jam_bluetooth.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/what_should_a_24_month_old_know.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_601639c688eda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lutepotazor.onlinewebshop.net/bevif.pdfIn PDF document text
    • http://geralumumavol.rf.gd/jozezakobirowofotuvarador.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_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5724 bytes
SHA-256: 3c20cea615dc9022a241a9eb818396c5b33993633626584b6a83df4e217e5128
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 10660 bytes
SHA-256: 3c401d0af0489dfb09d9369bfda3a8fa4c027328264b906f7d28d6f9c0a2c89e

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