Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd22cc129b316ecd…

MALICIOUS

PDF

92.9 KB Created: 2021-05-09 15:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b6f05a1cfa6d3d630dbb59c20179b67c SHA-1: 2e24a825a59a7a2f795b41d492cc8363fbc2af70 SHA-256: fd22cc129b316ecd57fded3886bf503f0f6e8aa8fbbdfb2bbc390c837ba6ca88
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to zajinet.ru, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true destination or evade detection. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/strik?utm_term=longinus+on+the+sublime+pdf PDF link annotation
    • http://gixapedotamerow.mywebcommunity.org/act_test_dates_2021_oklahoma.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/gusojumif.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/apprendre_l_espagnol_en_francais.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/astronomy_quiz.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/61433110926.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/how_do_i_setup_my_hp_laserjet_p1102w_wireless_printer.pdfIn PDF document text
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/3653604.pdfIn PDF document text
    • https://bitepurumuxuz.weebly.com/uploads/1/3/1/3/131378930/5920490.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/new_catholic_encyclopedia_vol_9.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/spinal_anesthesia_drugs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zupitatip.atwebpages.com/msi_890fxa-gd70_price.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/befomosijenip.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/kubota_bx25d_wheel_weights.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/abandono_escolar_no_brasil.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/52351531188.pdfIn PDF document text
    • http://nofolimuri.myartsonline.com/fapefoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/airbnb_css_sass_style_guide.pdfIn PDF document text
    • http://xufoziminep.onlinewebshop.net/63014093806.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/application_of_biostatistics_in_public_health.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/twilight_2_full_movie_in_hindi_download_480p_filmymeet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 5112 bytes
SHA-256: 5d55bc78327f8dad3c5510002b2329dd7ab438657212cbec9f8c068b17796e5d
font_01_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 15156 bytes
SHA-256: ca9084a7b2f9a7d4212fcd0ffcf51c34d2bdd3898018fc6fe893fd4c29e2f6ea
font_02_sfnt_off00015873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15873 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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