Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4b447b85614922…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 14:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7f0faf8b1587f9a742a36fd42884750c SHA-1: e9caac0da4af4ccd3f69a3b836807b7d0547e190 SHA-256: 8b4b447b85614922da2434caf8400e752efe5e6d076e5423cc4ccf31532e12b1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/wix?keyword=commerce+science+mq+2020+handbook PDF link annotation
    • https://lifufamaz.weebly.com/uploads/1/3/4/6/134685481/bikujegedewupiv_fiperimijas.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/buwokamapazonel.pdfIn PDF document text
    • http://wetomesidis.22web.org/bubble_answer_sheet_1_50.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/5727706.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/jepozuzam.pdfIn PDF document text
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/1258c29b0d422d.pdfIn PDF document text
    • https://wawulawad.weebly.com/uploads/1/3/4/8/134872625/gitavupomutajitovas.pdfIn PDF document text
    • https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/8d0efd2653bb.pdfIn PDF document text
    • http://lavkavkusa.store/love_you_libro_trilogiaj0m8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_600baa66e969d.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/699c45a88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_6019dd204cf3a.pdfIn PDF document text
    • https://puxasuzad.weebly.com/uploads/1/3/4/3/134352875/84970eabb1292.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/nj_transit_bus_164_sunday_schedule_1630c373.pdfIn PDF document text
    • http://xakuneferufilew.iblogger.org/56397736193.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
    • http://dupebuw.epizy.com/polite_words_worksheets_for_grade_2.pdfIn PDF document text
    • http://relogevavikidid.epizy.com/i_am_barbie_girl_song_320kbps.pdfIn PDF document text
    • http://ratimoli.epizy.com/glioblastoma_multiforme_pediatria.pdfIn PDF document text
    • http://kezadovimitaw.rf.gd/kowtow_crossword_answer.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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 5480 bytes
SHA-256: 2f11be74d2925092f6ffe9028c4b06514abc163d993ad6bc91dd147ac62058d6
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 11020 bytes
SHA-256: 56e8cd21c34050684c15a8e9756ad7d3292edcb9000793a49d1d8405ac513e76
font_02_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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