Malicious PDF — malware analysis report

Static analysis result for SHA-256 326117d7c7e8d8cb…

MALICIOUS

PDF

96.8 KB Created: 2021-03-26 09:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 271eba8928e8ac52f68d4b6706ea2fd6 SHA-1: dd0d62ace7e3eaa10cbd98600192dc2bf5147933 SHA-256: 326117d7c7e8d8cb65a5a47eff9e99b13159dc8452600bdcf5f5dbd309e8902b
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 0.9996

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://gimoguvi.ru/123?utm_term=catholic+mass+guide+bisaya PDF link annotation
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/e4c9d9.pdfIn PDF document text
    • http://winfreeiphone.xyz/gimuweronujb93py.pdfIn PDF document text
    • http://prodive.su/104369097381c9fh.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/99303399883.pdfIn PDF document text
    • https://toralalog.weebly.com/uploads/1/3/1/4/131436966/libuvisomik.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/books_about_reading_comprehension.pdfIn PDF document text
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/mavefasog_lopumoze_bekav.pdfIn PDF document text
    • http://steh-sistem.ru/tudamekotuwegumepawul155rv.pdfIn PDF document text
    • http://xegevapu.iblogger.org/1725559299.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/ronunubafuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufuxoponuwuros.epizy.com/crystallization_of_copper_sulphate_lab_report.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_d9b8333501cd4d58859519f9e55f0141.pdf?index=trueIn PDF document text
    • http://gogujigasad.onlinewebshop.net/vevigiwivubug.pdfIn PDF document text
    • http://xuvatifovefad.epizy.com/way_back_song_free.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_be03f284907d499ebb6effe45b62ca44.pdf?index=trueIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_f40c9650d54c42c4b7510bc675daba89.pdf?index=trueIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_3cd71362887841bf9c9086f929b2beab.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_3df28d1421a64503bc248a5d84a66767.pdf?index=trueIn PDF document text
    • http://liraperuwuw.atwebpages.com/aeschylus_eumenides_summary_sparknotes.pdfIn PDF document text
    • http://jaxojuruwak.rf.gd/physiology_of_hearing_and_balance.pdfIn PDF document text
    • http://kikodanaso.epizy.com/nada_carmen_laforet_english.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_off00013ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA0 5404 bytes
SHA-256: 0d80bee11a26b8565e8c05fd63d803bf76d778cee8ddcfe6c9e7f428e0561345
font_01_sfnt_off00014edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDC 10808 bytes
SHA-256: ec3def35cda3513a2ca353e3771a4924eefc73348fe0dfe9bf36e07fa8c273c7

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