Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d899fc8d11038f…

MALICIOUS

PDF

71.4 KB Created: 2021-02-26 18:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 05e68359729d8633d0e6d12ea8f681c9 SHA-1: 4050239aaec821699ac589f5560181dc5b882859 SHA-256: 28d899fc8d11038fce410c1a11a994c34a5ddc81e7b075d5975b07a2f1fae97e
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. Heuristics indicate the PDF is part of a link farm on disposable hosting, and ML classifiers strongly flag it as malicious. The presence of urgency language further supports a phishing or malicious download attempt.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/award?keyword=who+is+doing+free+covid+testing+near+me PDF link annotation
    • http://bumumapa.mypressonline.com/zozelotom.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/4Cihqli/fudajupo.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/34966279121.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/gggcSja/warepejobugujasuvamowazen.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/timozavowudelagedarewoz.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/hdgcUge/fastmed_urgent_care_west_valencia_road_tucson_az.pdfIn PDF document text
    • http://venira.su/jafejiwirolenapotu0nwun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fdb6162bb2fe.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/17021642686.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/lexuzaxusepuwotupiwiruwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_5fd844af897b1.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/do_car_seats_have_expiry_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_602a53a93223f.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/ZJjaMgg/ordinal_data_analysis_methods.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/24615658876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/watajive/asquith_bowling_club_annual_report.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/ti_nspire_calculator_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/24685404811.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/care_bear_wallpapers_free.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/dell_latitude_d830_ram_replacement.pdfIn PDF document text
    • https://medlineplus.gov/covid19testing.htmlIn 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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 5476 bytes
SHA-256: e71e828a41ce3776287736124749e1a4dac429e5b91847aac3291a6bb35c6af4
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10312 bytes
SHA-256: f718811f4ed63cf7db0643c5190324efd76308d73069bfcdfa96facc9fbd66ca

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