Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2931c7bd8e3e40…

MALICIOUS

PDF

99.0 KB Created: 2021-02-24 06:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b0ae996042d98be71cab93f1772b425c SHA-1: 08e8194e7e85397e69e0b5aa8362eb57442f19d5 SHA-256: dd2931c7bd8e3e40212e7a10cf172460278807e4e2ebed6c284e43d2d34e4b0c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

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/wix?keyword=how+to+grow+wild+garlic+from+seed+uk PDF link annotation
    • http://lnstagram-verifedbadge.com/48118859810082ae.pdfIn PDF document text
    • http://winsl.space/lord_of_the_rings_book_order_redditebhy4.pdfIn PDF document text
    • http://1fps.ru/sekebodowigoxakazigonefwdzfs.pdfIn PDF document text
    • http://afracheat1.xyz/dasopowizarosr4i.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/hm_inspectorate_of_probation_annual_report_2018su0yy.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/g0rhhfN/tofu_girl_ad_song.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/KCHnjhd/kuxegoviro.pdfIn PDF document text
    • http://milansit.space/gexilieh9j.pdfIn PDF document text
    • http://italywom.space/nightcrawler_fishing_wormstk4jq.pdfIn PDF document text
    • https://vatawasuri.weebly.com/uploads/1/3/3/9/133997312/5484498.pdfIn PDF document text
    • http://fringigejy.site/9968870019464rft.pdfIn PDF document text
    • http://maska-respirator.com/magic_chess_bang_bang_cheat_sheeto3hvg.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/ede33.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/hdB8hgc/counter_terrorist_agency_cheat_engine.pdfIn PDF document text
    • http://texno3ua.com/54362829633f0blw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxelifop.epizy.com/org_chart_creator_online.pdfIn PDF document text
    • http://pikazunelovo.epizy.com/pippin_musical_script.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_off000146f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 5456 bytes
SHA-256: dbbda660fa5f6105278d0aea29bef56a3fde130f2248ff37dc150ae5f04e2a7b
font_01_sfnt_off00015987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15987 10888 bytes
SHA-256: cd48d30d93b88590ec21cd8370f23616a7a7fee3a9cf6491e4f9f12a05c2683c

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