Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d1aaaa0aa02d6a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 07:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8391399da3d9280d72fb7ad25348404e SHA-1: 932fa9a37c1558756d44a4f85945a7da5c591c5f SHA-256: a4d1aaaa0aa02d6aa7b652685b14438b06397bdca197219e5243ba293842c6bc
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://crophysi.ru/strik?utm_term=honeywell+th8110u1003+thermostat+user+manual PDF link annotation
    • http://lizoguxumugef.mywebcommunity.org/cours_complet_d_algorithme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_6026fd7714e41.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/yamaha_703_remote_control_spare_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393626/normal_5fdd3db225b78.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/23825496750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_600eaf3cd97af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_60261923dc81e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_601ae3ab63f65.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/203a4d37-abbb-4d0c-9fa7-9fabbe166f2b/81468500194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ba6d12-89f6-4a66-8f84-f4a77f0dfeb8/philips_bipap_autosv_advanced_system_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35cf37ac-cdf6-444b-9cc0-a6a4f389a8e8/wings_of_fire_the_dragonet_prophecy_chapter_4_summary.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_1472fa2f7e724454a71195494805c025.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f29f534-d441-4b98-a06b-ba05cc3de975/bosakozubijitutaxepa.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/mutuxudurolopupefubeliz.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_4efc14d6b26f4fe3bc52eca86b2c4ed0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec2668f-8c52-468e-9e11-8750532e8a5c/41811156862.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/42567377605.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_e901c20a2c754849af020cc5804d917b.pdf?index=trueIn 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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 5632 bytes
SHA-256: ac6adc698aace6a83f44652e29978088847d8889426548517217aee071d9b9f2
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10500 bytes
SHA-256: 512961977690eb7f7986da8ab13a5f43944bfec12e1743ded06b936937a2a2e4

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