Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd91a894b7ff8bdd…

MALICIOUS

PDF

69.9 KB Created: 2021-03-19 00:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1394a4dc0bd4482cb06377b92e632d SHA-1: 571295e27d6c6315086833e1392fd1b11ef3b0b4 SHA-256: cd91a894b7ff8bdd85567081c06a0a010f2cd5d6d36508b2d647b89eed94858c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to artificially boost search engine rankings. The primary URL, https://mezovuduw.ru/wix?keyword=dynamo+the+book+of+secrets+pdf+free+download, suggests a lure for users searching for specific content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=dynamo+the+book+of+secrets+pdf+free+download
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/9543865.pdf
    • https://tewawabuse.weebly.com/uploads/1/3/1/4/131437503/8990524.pdf
    • http://dawexefif.getenjoyment.net/stephen_kings_it_1990_full_movie.pdf
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/newaxoremobisin_lokaxovuzupek_kurizelo_wowapavixetisi.pdf
    • http://niwopofe.scienceontheweb.net/konstruksione_arkitektonike.pdf
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/7471915.pdf
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/vurenozaf.pdf
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/ef5d59.pdf
    • http://bubiwikozexamo.iblogger.org/tiwaduve.pdf
    • https://dukazisilibe.weebly.com/uploads/1/3/4/6/134679988/vuxutadijewivu_fedikupaw_toxepenop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rujabepifar/21964211536.pdf
    • https://s3.amazonaws.com/lorifawuvawot/mufuno.pdf
    • https://s3.amazonaws.com/padosumifubobo/92497939289.pdf
    • https://s3.amazonaws.com/vinejivunitego/alivecor_veterinary_heart_monitor_user_manual.pdf
    • http://tezajiduzut.epizy.com/chikmagalur_tourist_guide_map.pdf
    • http://gugevifuvonavir.epizy.com/folubozaxaxi.pdf
    • https://s3.amazonaws.com/luropi/air_conditioning_and_refrigeration_technology.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ad.bin
b97c7ef9777e7d8800ca9b04de09dbcdbd4b07b50c4c4da7785011f5229455aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 5792 bytes
font_01_sfnt_off0000e655.bin
ff02fbcd9d9068adbdf29487240d97690c6ffefd7dd21ae88724f02cf6e6e6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 10592 bytes

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