Malicious PDF — malware analysis report

Static analysis result for SHA-256 66df1e522e79efa3…

MALICIOUS

PDF

72.4 KB Created: 2020-12-19 02:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cba57972bb4254e232165a225d5c48ab SHA-1: 92f8d082fd0bcc5a704eec8d78135fb82397919b SHA-256: 66df1e522e79efa3ba0ae4edd545d63e51545ccf8a732ada68ff1848482238ca
156 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 0.9997

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 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.
  • 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://trafffi.ru/strik?utm_term=the+great+gilly+hopkins+book+reading+level PDF link annotation
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/tojekagir-dojewarasufak.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/5095386.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/vexetukalutine-tozetavez.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/tojajixubunigerus.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/tekase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/bidelofewipowim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11b97c4-68e2-4452-a542-e682fb5c02ce/rowayton_elementary_school_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/images_map_bermuda_triangle_geography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fb8d0c-a067-4ac2-8a47-86fbf13074af/special_interrogatories_california_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/filirikerunamaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe26d1b-fe40-4905-a57d-039786627f61/five_nights_at_freddys_4_unblocked_games_scratch.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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 5536 bytes
SHA-256: 6de693760e6164489caffaaaca6046bf09f1872a5a68657bccd5874928fbd331
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 10160 bytes
SHA-256: 794d8d776be4c19d034ba13d863aec2faf539c4b314550b417a7aae324fba218