Malicious PDF — malware analysis report

Static analysis result for SHA-256 356ba1fd2947fedb…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 12:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 059328a5b34a1af8ab13aadfb5f2448a SHA-1: 90f89ad1c5ca9af04304d6ddda2181c80166c797 SHA-256: 356ba1fd2947fedb90546415e32af2a1eea083eb82a5e185b88a5b441b51ed8c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of common techniques used to redirect users to malicious sites.

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://seumenha.ru/strik?utm_term=how+much+weight+can+you+lose+by+drinking+water+for+3+days
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/3433733.pdf
    • http://tatanip.medianewsonline.com/saligokodikonexubuwovowib.pdf
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/6126340.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/gutuxoniso.pdf
    • http://xefopuro.mypressonline.com/a_discovery_of_witches_season_1.pdf
    • http://gigazukiwizave.22web.org/buloxono.pdf
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/sagusut_kekilil_pavogaguk_wadugusu.pdf
    • http://kejoxemubogese.mywebcommunity.org/take_5_oil_change_reviews.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sojebelevenex/mapudipazumifopusofodu.pdf
    • http://rabuwupitakif.rf.gd/70936335211.pdf
    • http://judiserod.onlinewebshop.net/taber_s_cyclopedic_medical_dictionary_23rd_edition_free_download.pdf
    • https://s3.amazonaws.com/jupudizadid/zeguvizenaj.pdf
    • https://s3.amazonaws.com/gafedupeba/31846670307.pdf
    • http://jumezezufa.rf.gd/gosivifu.pdf
    • http://jedasuzafofirif.epizy.com/the_disaster_artist_streaming_australia.pdf
    • https://s3.amazonaws.com/gewuwasi/xesujuzopubovazofopogid.pdf
    • http://vufagemabon.rf.gd/40835999681.pdf
    • https://s3.amazonaws.com/rawesaragegugar/dysgraphia_worksheets.pdf
    • https://s3.amazonaws.com/jovekus/status_saver_for_whatsapp_apk.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_off0000e95a.bin
714c5f7a6a83e341db4187be24e657f202a7787c731022e833a1b288e041c4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 5956 bytes
font_01_sfnt_off0000fd93.bin
733a551ac0b16dd4e35685ff4f3fa6f7bc353bd089f22b91581c5dc6b36d56a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10536 bytes

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