Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cbf55e2b9df2b4…

MALICIOUS

PDF

79.2 KB Created: 2021-02-28 13:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1f9c2691180ad7e2775ba7b9b837c9e5 SHA-1: ca0812fe5d2fb2dc33d32b06dd0b6a0db0371be1 SHA-256: 77cbf55e2b9df2b4778550ad1f18e719a451f1f2bf07afba223ecacc562997c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, with 'jacksth.ru' and 'aicberg.net' being prominent examples. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/award?keyword=active+listening+definition+in+communication PDF link annotation
    • http://aicberg.net/billetera_movil_banpro_bloqueadasi5vh.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/voromo.pdfIn PDF document text
    • http://naworigexoz.iblogger.org/81395625562.pdfIn PDF document text
    • https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/saketekulexufo-mupowebin.pdfIn PDF document text
    • http://wewedaz.iblogger.org/cartographic_design_and_production.pdfIn PDF document text
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/ferupufikisema-fewujuvirunurar-mufow.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/fidefofudi/2578138788.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/92729690778.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/64325034823.pdfIn PDF document text
    • http://vomotoboxavixot.epizy.com/bedidixoru.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/spelling_test_template_20_words_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/badges_of_fury_tamil_dubbed_movie.pdfIn PDF document text
    • http://pulijivugis.epizy.com/animal_crossing_new._leaf_guide.pdfIn PDF document text
    • http://patikogoxuxit.epizy.com/funopixowaxofaximaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/gadesuwetexizofago.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_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 5292 bytes
SHA-256: 8d8546cbe0af5c48e4accdba91088e37381d082cd4539d054fddb0b973cff94a
font_01_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10288 bytes
SHA-256: eb9d278c7abdfd1c985ddc446dca61bf4e795e1316f8e31af3fad83a3a48e829

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