Malicious PDF — malware analysis report

Static analysis result for SHA-256 c242fcd4ad19094b…

MALICIOUS

PDF

66.2 KB Created: 2021-03-15 09:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 17e94de698a75fe8537ec833a02cef59 SHA-1: da7b4588f1ed3808253feede14aa548b1bfe37d9 SHA-256: c242fcd4ad19094bd3ebcbbf54c99eb80f0bb148d5c8f3527a5309a585b99fa5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The embedded URLs suggest an attempt to deliver a second-stage payload or redirect users to phishing sites.

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://fokemale.ru/wix?keyword=gta+v+android+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60118fb33cc93.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/ojceheJ/vitenipubut.pdfIn PDF document text
    • https://cdn.sqhk.co/binuwaxe/iaidKib/mla_bibliography_format_article.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5fe29de7043a2.pdfIn PDF document text
    • http://nezikitif.iblogger.org/vidolaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/eZIfBks/translate_web_page_chrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_6028a762ced9b.pdfIn PDF document text
    • http://kovokibiv.22web.org/le_courant_bhavioriste.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602eac5ddb71f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_6019f70f53d76.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/71ROjg3/90279983896.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/29579fb9-85a8-4ca1-a283-1dbe0521695a/61389704089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493006ad-c3f2-466d-ba3f-9425ebbc7a73/61538279462.pdfIn PDF document text
    • http://juzatapanosuwi.rf.gd/savupakegoxiziwipukifanes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e143fee-5a76-4881-b812-7816cfb8ef42/how_to_disable_viper_car_alarm_permanently.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538af37a-0b6b-4672-bfc2-733abba75b86/tiraxisijajonubesoxali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89736eb4-5233-4df3-bdf5-1ca9d6786789/gukapumewirovef.pdfIn PDF document text
    • http://davagutuvis.rf.gd/womuxopano.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F4 4900 bytes
SHA-256: 35df77dd60d5c449d0b60acbede159e3f6bc91736b1f3b746173621cdb97e0e2
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 10696 bytes
SHA-256: cf634ac6e7faf4fff7b00808c8c52d21aab345170ef4f23de432797cab3744ff

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