Malicious PDF — malware analysis report

Static analysis result for SHA-256 902cced821c94ba1…

MALICIOUS

PDF

92.8 KB Created: 2021-02-09 08:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 62982c45e414a9d43ce8fd2016ea78ad SHA-1: 91c1777a91234d07b9ab29ab79979b27db12e546 SHA-256: 902cced821c94ba186569bf9fba010b6fef4bb92c847aaac05d6161be3eb1e1a
126 Risk Score

Malware Insights

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

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is intended to redirect users to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=analogy+for+cell+rough+endoplasmic+reticulum PDF link annotation
    • https://xovuxajewilim.weebly.com/uploads/1/3/0/7/130775567/1910221.pdfIn PDF document text
    • http://helplnstagramoffice.com/17283331912nk4bu.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/c546d83b0.pdfIn PDF document text
    • http://flathead.us/circle_empires_free_download_latesthnuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fd61b2e777bc.pdfIn PDF document text
    • http://lulodexav.iblogger.org/pavivikug.pdfIn PDF document text
    • http://agreevudb.rest/android_tv_remote_control_app_githubswtyq.pdfIn PDF document text
    • http://topdouche.xyz/ismart_shankar_dj_songs_remix1i5nv.pdfIn PDF document text
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/c413751a1719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379616/normal_60089b5fb4d7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5ff62e67d60b7.pdfIn PDF document text
    • http://olivamebel.com/auction_sniper_reviews_2015o173r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putiweg.epizy.com/35417237229.pdfIn PDF document text
    • http://wefofumerari.rf.gd/arjun_reddy_full_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/free_sap_accounting_software_latest_version.pdfIn PDF document text
    • http://lavofedelozus.rf.gd/solitaire_tripeaks_unlimited_coins_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/cooling_tower_tr_calculation.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_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 5660 bytes
SHA-256: b396e5e52461d86d99342efbdb8309cd1dc84b311affdaa3c5a883d2faa5d10f
font_01_sfnt_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 11728 bytes
SHA-256: cc97bc7eca10a3d53fba9b5c9fd8f60ad65b0f7aca71c04c417672c16223d63c

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