Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea40bab97e9e148b…

MALICIOUS

PDF

76.8 KB Created: 2021-05-31 14:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73a9dc0da48d7ff28b95222bddb766bb SHA-1: f8edd8ef5540e7ed3c32056d6ea7ef1cc749b049 SHA-256: ea40bab97e9e148befa4e30c327188da84b0e81f7f76bf6095b32c586b3a628b
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 0.9997

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://kuzutuzo.ru/123?utm_term=birthday+cake+with+personal+photo+free PDF link annotation
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/3a002263.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/ab3d6d6a382.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/85fd70b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_604f0b9223afc.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/1511029.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/betimemolofiza.pdfIn PDF document text
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/db7362e1.pdfIn PDF document text
    • https://dubutabinagi.weebly.com/uploads/1/3/4/4/134441981/bejewibujexili.pdfIn PDF document text
    • https://veranaza.weebly.com/uploads/1/3/4/6/134665567/vazemuromitokejew.pdfIn PDF document text
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/2c43e83f776.pdfIn PDF document text
    • https://xukedajatoxejas.weebly.com/uploads/1/3/4/4/134481228/jupazi-kalifazugameg-gofagamape-lufun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462681/normal_5fec00421e120.pdfIn PDF document text
    • https://xebagamalod.weebly.com/uploads/1/3/1/3/131383607/pededu.pdfIn PDF document text
    • https://zunotebizi.weebly.com/uploads/1/3/4/6/134648513/3210242.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
    • https://uploads.strikinglycdn.com/files/660b5b20-c194-4b15-a45c-0aaffe8a342e/longman_dictionary_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75275808-9f4b-4a84-a75f-5321625bc27a/whats_the_difference_between_pragmatics_and_semantics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84cd81fb-d9eb-45ca-8397-8b7d426cf50c/1979_chevy_impala_engine_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915c4076-42df-4c4c-a93f-ec93645d00b6/majugoviluwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a126ee5c-4c96-406b-a445-e9942750e2f0/list_of_fallen_order_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9fafa14-fb7b-419a-95e4-235161f8e6f6/mogete.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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 5340 bytes
SHA-256: fe60b56f227d627ec1d695c09038756139f468785282b9258d17579be2953ee5
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 10396 bytes
SHA-256: ccd9d79e1a2748ded226283f7ed8c07d83012a3bf0971a0cca2ebdbfe7ca9a2c
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3