Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4369875428b2661…

MALICIOUS

PDF

90.0 KB Created: 2021-05-12 22:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2928e9127ac5b13a309a5940a7dc30a3 SHA-1: e65a1bdf1a413a0e6cd7a44d2c199cbd80e1bfb9 SHA-256: c4369875428b266120d4f205b317d9198e3559e034251d0d6982064aaec055c6
156 Risk Score

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 potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

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 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.
  • 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://leonvi.ru/strik?utm_term=comptia+linux%252B+guide+to+linux+certification+5th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fcf5a45518a1.pdfIn PDF document text
    • http://axacheat4.xyz/arcserve_udp_v6._5_workstation_edition3buxc.pdfIn PDF document text
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/juvomob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_60290eb2a5066.pdfIn PDF document text
    • http://bigowet.xyz/maruvejonutiluwefizuxune9u459.pdfIn PDF document text
    • http://kapusta.pro/ccna_lab_answersq6o8v.pdfIn PDF document text
    • http://ig-copyrightviolation.com/1717996452244ql2.pdfIn PDF document text
    • http://italiahot.space/mubowe1mstn.pdfIn PDF document text
    • http://zootime.store/18663457227m57w2.pdfIn PDF document text
    • https://guwulazavuwaba.weebly.com/uploads/1/3/2/3/132302871/sibapu.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/todilixerubewo.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/dujuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/48781522429.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/wujokelilasewem.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/html5_game_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/what_is_the_best_chord_progression.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/82662481829.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/2617561599.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/sunbeam_bread_maker_recipes_5891-33.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/gudorerew.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_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 5488 bytes
SHA-256: f64f3c2eb9da26db82cfc3bdbf53f4359069fe15056bb0238eea0f14ccb877e1
font_01_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 12128 bytes
SHA-256: 845dcd80024ee00ba8b9ec4bcfd750f28e27305854488268317f7bf4d6c24fe0

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