Malicious PDF — malware analysis report

Static analysis result for SHA-256 08351d4d1fad265a…

MALICIOUS

PDF

73.0 KB Created: 2021-03-23 23:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde80d85bf676f0d52420ed2459ddebd SHA-1: 3344a3cca3ab00c839893f0af01aa18b5bc38cb2 SHA-256: 08351d4d1fad265ab19ebce76145982b278f24336471fdb31218f04ba388d663
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to deceive users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were extracted, the presence of numerous suspicious URLs suggests the document's primary purpose is to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=cisco+switch+enable+vlan+routing
    • http://dimax.website/c_est_fini_la_comedie_pianorj273.pdf
    • https://cdn.sqhk.co/saseponirifa/7jgijN6/best_free_password_vault_app_for_android.pdf
    • http://libralab.digital/dowepuboxelozo24fx5.pdf
    • https://cdn.sqhk.co/munuluxel/fgdgiHP/nekonilikali.pdf
    • https://milanesove.weebly.com/uploads/1/3/1/3/131383497/puzivaxapetuz.pdf
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/51b744.pdf
    • https://cdn.sqhk.co/wowedofu/hijdNih/suxamevas.pdf
    • http://disconto50.info/vevewomipalehxra.pdf
    • https://litusavetedi.weebly.com/uploads/1/3/4/4/134445261/82bf3d7.pdf
    • http://straponartist.com/7th_grade_math6fs2t.pdf
    • http://argo-tourism.com/95800505556kjm3g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mafavuzenoliki/visubepegutine.pdf
    • https://s3.amazonaws.com/mipeboro/wukevafumusufewavudum.pdf
    • http://xubaforan.epizy.com/pokazapabazekat.pdf
    • https://s3.amazonaws.com/wujixus/arma_3_server_files.pdf
    • https://s3.amazonaws.com/lanorolowu/kamalodonitibafemusixofa.pdf
    • https://s3.amazonaws.com/paxuvagal/tolizojatawaduxopa.pdf
    • https://uploads.strikinglycdn.com/files/2f65b3ed-dbfb-4c08-8d47-da7db2b33cd1/brinkmann_gourmet_charcoal_smoker_mods.pdf
    • http://jopewadakos.epizy.com/autobusu_stotis_kaune_informacija.pdf
    • https://uploads.strikinglycdn.com/files/77021bb7-d69f-4d1a-a51c-d47fb7e74f5c/binekosibuponilixeke.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_off0000dff2.bin
e4f31818bcc1d97e4fc787d9f785548e36a5456f60839263f14b3c6f2763d8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 5256 bytes
font_01_sfnt_off0000f1e8.bin
faf90b80328411fd925c6e1ce4ec8da0af3004c39e981353491fb63de4a3db7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10712 bytes

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