Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf65d5fa1dfecc0c…

MALICIOUS

PDF

88.0 KB Created: 2021-03-02 11:38:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 59064e350a1399fb6af3b425133ed40d SHA-1: b1b289e6edf0da1ad8138f17aff92388df5e6a53 SHA-256: bf65d5fa1dfecc0c2b25bb55e2848479dfb396722f18ec74cb450b87d0f17014
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jumiwimov.ru/wix?keyword=neurology+nbme+3+answers PDF link annotation
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/fed67a.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/buzarazitir-golimuzuxeba-sudemuwiwurimok-bupifizufuwito.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/zagebala.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/gehiNic/naketovudetivodadufo.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/Ijc77hh/48986508380.pdfIn PDF document text
    • http://kizoxuvufanisuf.iblogger.org/disozizaf.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/wodatel.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/21804603302.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/hhNSVhc/6557229969.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/a38411e467.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/ef7a7.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/guess_logos_level_207.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/hhLjghj/xutebimemudijed.pdfIn PDF document text
    • https://xosebabonewita.weebly.com/uploads/1/3/4/6/134613761/25e34cf8ce7442.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/vezedomela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiratobut.rf.gd/tulaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/85821131396.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/free_utorrent_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/basic_shapes_worksheets_for_preschool.pdfIn PDF document text
    • http://texepov.rf.gd/83646736885.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/27340995914.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/rolajipobapavufugolugox.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_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 5472 bytes
SHA-256: 07a21c327440f8f3e8a56ac57af846471e336d599ddf5f46566a29cf4bbcde92
font_01_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16944 bytes
SHA-256: 604a7efe85d5f80d997844c50556ed8ebafbb2def472cf254a9e874aebdda6e4

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