Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4df2dff738e1d0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-26 07:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b8272e8f3ee73a8187ba1d2e94760977 SHA-1: bea2321bb691622f7dfec2c3d6f17d9279a2327b SHA-256: 2d4df2dff738e1d03a89f142d1a39b5547866c77dde7f7a71cebabb2bca977be
136 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity rule indicating an image lure linking to an SEO redirector for phishing. The ML classifier and ClamAV also identified it as malicious. The embedded URL, https://seumenha.ru/award?keyword=solar+hybrid+air+conditioning+system+pdf, is the primary indicator of this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=solar+hybrid+air+conditioning+system+pdf PDF link annotation
    • http://jaliwif.22web.org/76141177676.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/ibhcl7V/movie_now_playing_cineplex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_5fd13a315792e.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/ajhMsgj/kapowijuwitogopiwijiw.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/XjdjbJp/fugagofopoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_60586a74e4692.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/hhhiahc/27678485456.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/fjdiaLM/mermaid_simulator_3d_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_601d9b444d165.pdfIn PDF document text
    • http://pokafusolitix.iblogger.org/ct_file_online.pdfIn PDF document text
    • http://nijubuwuw.iblogger.org/kovefoxadepebimis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pirafabitibabik.rf.gd/protein_primary_structure.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/79498945328.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/how_to_apply_sea_bond_denture_adhesive_seals.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/visovevobirizitar.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/wasoxosukimofiwajejanifev.pdfIn PDF document text
    • http://pofotelomog.rf.gd/dsc_832_installation_manual.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_5a4d5806c73c4d9d8e2928c5ef8e724e.pdf?index=trueIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_573b367edb264ca1bbe0a6fd7228ca0f.pdf?index=trueIn PDF document text
    • http://rolozipufulelo.rf.gd/59910161506.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_568c9d1e8b7e49f08245defffbe2023c.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_1a063010820142caabcc9b0b338a30c7.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_01bc76fd492146299a8e637ad24213be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/zurawadetufizaxosibus.pdfIn PDF document text
    • http://duvewukabiwetu.epizy.com/bawagifibiximifir.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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 5912 bytes
SHA-256: 18b9cdaabbb59cc86d601ab1bf1494884963bc0f94ee5c6ae9e1af346abed2a4
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10636 bytes
SHA-256: 5bb20b9868157c251c2193341792f0cd058271c302488726297c023f7dadc736