Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b99b3f3ec231dd…

MALICIOUS

PDF

89.3 KB Created: 2021-05-12 18:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5efa1ad9fca2a4f6da35d151012cca11 SHA-1: b72aea0ee6381cfe8419c3d78eafc47026006785 SHA-256: a1b99b3f3ec231dd88a3b5ea7bade373b3edef3309d0533d3f5f790aa0d06860
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable domains, suggesting a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=n2+electrical+trade+theory+book+free+download PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/difuJjh/lilonibekude.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/shgiFhi/kowujam.pdfIn PDF document text
    • http://folejaf.mypressonline.com/91472263158.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/rijiaje/browser_button_synonym.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/lozamojabarirejeda.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/fuzivalew.pdfIn PDF document text
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/0976c3f9a3c28aa.pdfIn PDF document text
    • https://xopilinunerixaw.weebly.com/uploads/1/3/1/3/131380618/4366918.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/54795015064.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/eijgiii/ragdoll_simulator._rbxl_bat.pdfIn PDF document text
    • https://cdn.sqhk.co/konarolikomu/jijbkGZ/72869104553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf991163-c0d1-4f8e-ad7e-102142f10d10/ti-30xs_multiview_scientific_calculator_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be83ee46-d8b5-4ea8-8e95-774ee5fa495c/fesejibanekar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b4929e-54d2-4696-8fcc-d7e1eed5f92b/what_is_business_communication_and_report_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f8bd5d-3ffb-493d-bf34-7736cd9a4ae9/xekipefiranejipupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cd56b4-85cb-4b05-9c25-d9863e8b513f/identify_the_four_types_of_organizational_cultures_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7313b6f-a85d-4c95-acde-447c9115b3a1/legogiwuwidivusinela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d461a3-8dad-4584-a422-95b6baef2efe/sabertooth_990fx_r2.0_ram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b609eb6a-529d-4c85-b82d-51c0b494177d/tojax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b65e3dc-649d-4718-835e-5dca29513e91/befitu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 5432 bytes
SHA-256: a28ad988aefb098d11919a1974dc36167cd8a4ceb8d2cc24cd6d3abe69899fdc
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 11352 bytes
SHA-256: a587766cd5f17562ea3848df77c648563419c5d765256b1fbfc5c4901c4d1a1e
font_02_sfnt_off0001462c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462C 4656 bytes
SHA-256: 60c360a987d0603ca2cd2e832c33761e9ff0f02122ccfdf7fc3ad0f105fbcf21

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