Malicious PDF — malware analysis report

Static analysis result for SHA-256 87155912c4b996ea…

MALICIOUS

PDF

74.3 KB Created: 2021-03-18 13:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 94bb04d7664206d11d2e701ac8f778a7 SHA-1: b015f86cb38b2dece887c8b9e8b274e5cc6d3c31 SHA-256: 87155912c4b996ea23da2c85d192bca8295cc9162de15bcfc78153e9730d4ad5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/award?keyword=killing+the+black+body+chapter+2+pdf PDF link annotation
    • http://sinomefonok.mywebcommunity.org/42280945107.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/ezjagju/zozevobomalazora.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/biggest_law_firms_in_nj.pdfIn PDF document text
    • http://jebonefawudo.sportsontheweb.net/39614535603.pdfIn PDF document text
    • http://zolomakowifop.iblogger.org/konijanuw.pdfIn PDF document text
    • http://jukomanafow.22web.org/nafot.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/sfchhie/free_country_music_radio_station_online.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/hbKje74/juwirudujolekade.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/dhatsje/nijogobag.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/bM3VIib/retasuzulilanebidifeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roveramo.atwebpages.com/75543856245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf53e34e-232a-4713-b227-c69622016d44/example_of_college_biology_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba15e0f-d1d0-47fd-9ab2-1d54e8c41526/19245082464.pdfIn PDF document text
    • http://fupuvomevo.rf.gd/kupiwedegiloxagorexibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33b5d0f-de68-4a30-bfa0-101cf2118124/what_common_food_items_have_gluten.pdfIn PDF document text
    • http://jelelonu.rf.gd/31392794363.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/3274847755.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/tawinux.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/48254704537.pdfIn PDF document text
    • http://nokarox.rf.gd/86082161901.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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 5644 bytes
SHA-256: cd1f4efe106ab025ba98b863a814d3e9ca26136578309a4bef224e3810b2224c
font_01_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 10404 bytes
SHA-256: 436fc516de182c9803014ccc605bbe9939646b8c966775363c01f1e9f3e350e8

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