Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed933fce1ec073d…

MALICIOUS

PDF

83.9 KB Created: 2021-03-26 10:31:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eca01da7a8c38d4008e3a5054190f3dd SHA-1: 21350877e84a67b959bfff5a02915dd69fb84074 SHA-256: aed933fce1ec073d045bed8a7615e4a3a4f5b69ab2b91162d4713b8676d39ffa
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=la+metamorfosis+de+ovidio+sinopsis PDF link annotation
    • https://cdn.sqhk.co/dofexoxev/hfWijVB/battery_tender_jr._trickle_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/zepaginu/IoghTea/34697708922.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/3Zjdoia/92640831218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_6033551f0d1a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446942/normal_5ffb215b599f6.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/hihWhix/90970347698.pdfIn PDF document text
    • http://pojokup.getenjoyment.net/xugabododifigefalafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443624/normal_5ffcf00d733c1.pdfIn PDF document text
    • https://cdn.sqhk.co/kopubeno/ihgeIig/82699229160.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/GjeVoWj/50404121708.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/diNgcmX/73226369539.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/ghhjdCd/30405376563.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/accessory_to_war.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/258a4733-f5ff-4c54-a3cb-9a34a9ea6d03/47675435918.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_a8070682cec44691990e3b0dff9f0d63.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_753c7d3274724746ac6984e89d876d77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54dbc425-2646-4565-814b-4b72a046ae71/nespresso_lattissima_descaling.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/sbi_green_card_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec31c18-53c8-422d-aa87-30f5bfd681b0/97505842418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8efcdff-0ae9-41ff-a77d-f3816208f57c/worksheet_mixed_gas_law_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8620471d-fbc4-42c1-ae49-822606926ecf/rezenijokosa.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_29ccfc1429e7472b820d289cb1afc0cb.pdf?index=trueIn 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_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 5156 bytes
SHA-256: 78f9ac7921ab8bc96f8964b6e97f09fe25e711d9e59af0521d316686c8d04621
font_01_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 14440 bytes
SHA-256: b9918acbd15010cc4473b70176dc619e6ac5a117cdf6fb57f52fdd92b50665b8