Malicious PDF — malware analysis report

Static analysis result for SHA-256 d865e68981657eae…

MALICIOUS

PDF

79.7 KB Created: 2021-06-04 04:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a289d55a85294a10c97c9679d6bfaf85 SHA-1: dd80bd7df0fcdddf1f180ed751024f67079c18dc SHA-256: d865e68981657eaee7f1e1973f89ba5fe798278e4d5c6ff884eeedb21b1a1aee
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 0.9994

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://inwebjor.ru/pbw?utm_term=attestation+de+domiciliation+de+salaire+par+l%2527employeur+pdf PDF link annotation
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/c50a3f76408.pdfIn PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/taxojopugidewakara.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/jijagukawosufak.pdfIn PDF document text
    • https://xugatasota.weebly.com/uploads/1/3/4/6/134673622/gagubi_xipimetamo_zoxuzub.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/9398568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476927/normal_5ff3ee97d47df.pdfIn PDF document text
    • https://vipizavubo.weebly.com/uploads/1/3/1/4/131407691/govigedudun-muwora-luzabodezinope.pdfIn PDF document text
    • https://gowokijisamupu.weebly.com/uploads/1/3/4/4/134438950/671afefacb.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/5979987.pdfIn PDF document text
    • https://wulakajif.weebly.com/uploads/1/3/2/7/132740593/4235141.pdfIn PDF document text
    • https://xamuzufoka.weebly.com/uploads/1/3/4/8/134893590/zirazuvidawafo.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/kefilazipepido_vetuvotubopodef_tikebo.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/buxikatod_dogolatepaloga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fcbd040c9008.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144570147/vokilaxamoboneloxepaj.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/the_flu_full_movie_2013_english_subtitle_kissasian.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144536538/buledotivujasuk.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144517062/what_to_pray_in_difficult_times_islam.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/why_did_they_take_the_book_of_enoch_out_of_the_bible.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426507/87186256668.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/when_was_the_first_jail.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/how_to_fix_milwaukee_m12_battery.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 2112 bytes
SHA-256: 23ec186dc328e1e5b1e06c7844d6d61d47bf717e5b02c0af600fe164cdae3e6d
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 5424 bytes
SHA-256: 154e4cc76b5bcd376d71f8ec2011ee866607f8e563ad58dc88b95ebda084454e
font_02_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 12368 bytes
SHA-256: 2de0ee960f3d97034bb384fef74aa7e5b5d055e3efac345a136f03480e64069a