Malicious PDF — malware analysis report

Static analysis result for SHA-256 1142ffd3956b4216…

MALICIOUS

PDF

75.9 KB Created: 2021-05-21 13:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8cd1d666d9d92c73bf560a353a904d66 SHA-1: df49f756efadf052099c8ab148b91d13dcdc9e7d SHA-256: 1142ffd3956b4216ad58d14973cde33946bff0114a8793cdf8c70eada2160105
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 0.9999

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://kuzutuzo.ru/strik?utm_term=translate+convert+words+to+numbers+worksheets PDF link annotation
    • https://paladagaludoke.weebly.com/uploads/1/3/4/4/134460366/xosogi.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/c13478f.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/5994476.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/41a428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446633/normal_5fc7461248dfd.pdfIn PDF document text
    • https://rizipopene.weebly.com/uploads/1/3/5/3/135316145/9653872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fd2825c04dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380384/normal_6007f07e90376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_604a56aab3754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_6012bed387c3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac859abb-7606-48e7-9aac-59a835db7b43/is_solid_kcl_conductivity.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/24331298263.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/towezevudaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/what_is_l_actual_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6014f1db-c73b-44b4-bd6b-c706de2708ac/what_is_the_best_book_for_business_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6883d5db-bb0c-4460-afb4-325bedbae3df/auggie_and_me_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/what_does_it_mean_to_have_economic_boom_boom_down.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/sisobejiropiwasazitadunow.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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 5484 bytes
SHA-256: 78c500a503694ed11e76fceb210e95337d876946c8e5c9c218fd53e941b11718
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 10484 bytes
SHA-256: e2bbf351fe1e2256c32f6398ac31ac3dd607c7ae9d6027369336c4d288b86dfb