Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac3abc96ede7c98…

MALICIOUS

PDF

74.8 KB Created: 2021-05-15 13:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c9eaf5c328e8ba1dfaaa07ff3d82d0bb SHA-1: c909e35bdeb08d6756ae21be46fd6ea46efeab1a SHA-256: eac3abc96ede7c984a8350d5d1237c82b839f3e9b47da7f843848022890618ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=where+can+i+buy+a+metal+detector+in+ireland PDF link annotation
    • http://betmoy56.com/tagejomw6q8g.pdfIn PDF document text
    • http://uscovidcharts.com/best_free_dating_apps_2018hxa4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385412/normal_6006ad5943d5d.pdfIn PDF document text
    • http://instacopyrightcenter.com/rejalopibrthh.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/atif_aslam_new_song_2019_list_download_bestwapechl7.pdfIn PDF document text
    • http://creampiepow.club/68745953067xaxck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_606e555873bf3.pdfIn PDF document text
    • http://laithub.pro/game_of_thrones_season_8_episode_1_download_reddit9nob2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fe7a0a8e39e4.pdfIn PDF document text
    • http://erse.xyz/5400491265tx4jz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_605447b9cb195.pdfIn PDF document text
    • http://websporizlehd.com/lawigiwopupuxaxakoqcilq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388814/normal_5fdf70b9ae983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixikaw.epizy.com/vpn_express_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/resident_evil_4_mobile_edition_apk_2019.pdfIn PDF document text
    • http://wumikexenuge.epizy.com/cant_open_old_garageband_files.pdfIn PDF document text
    • http://vanepozimor.rf.gd/baghban_movie_720p_worldfree4u.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/basement_construction_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/chupke_chupke_comedy_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/minapofaru.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 5256 bytes
SHA-256: aab780500b8aa8600ff361b2aa0bb550163b4a843be3b99b87e9017ae3379c9f
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10932 bytes
SHA-256: 6bf729cd77d681cb82ccd0c49a079f4b65b9bf25a3731cc5670c1f81544f1c7d

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