Malicious PDF — malware analysis report

Static analysis result for SHA-256 5982586cc121ae8b…

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 05:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4142944dcd5fbc542aa49dc0c0e03fac SHA-1: 51d194901b7bd0ec93c48542be80cda8bb5b7a17 SHA-256: 5982586cc121ae8bf2e386c9631cc21ab96aeeb3e000b7c540317bbe129fdd8e
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://zajinet.ru/aws?utm_term=intermatic+ej351c+instructions PDF link annotation
    • https://cdn.sqhk.co/moviferu/hbhjgfz/levuvixidagilaremewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_600f2d85ce3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_6040b02bc6304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_6011b7d8ee38b.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/1000_vocabulary_words_with_meaning_and_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/5XjAief/grau_dos_adjetivos_em_ingles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_601f03e18297e.pdfIn PDF document text
    • http://pokawibu.iblogger.org/jagop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fed471d5d260.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/gigyN1K/mountain_bikes_for_sale_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_602fdbd1273ac.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/possessive_pronouns_spanish_worksheet.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/44634831475.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_9e593090d14c4a2495feddab8caa593b.pdf?index=trueIn PDF document text
    • http://fusipabi.epizy.com/lufin.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_24b7753472a34595946db5eedeb3e983.pdf?index=trueIn PDF document text
    • http://xumusuriwo.rf.gd/how_to_use_digital_multimeter_on_car_battery.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_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 5264 bytes
SHA-256: 5ffa74691cf2c992b70fedbd6a857cccd7b811086f274373318f5cee6016da07
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 11292 bytes
SHA-256: 60043c951b7e257fd4ba7ac671bce0fb537a3e2f3fbf2cd57397fb486d08e05a

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