Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb32863a31483661…

MALICIOUS

PDF

89.3 KB Created: 2021-06-01 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2d8441f0222b74adf6612388c1926e2 SHA-1: 545eda1258018b7479e78a5c8746488e29656001 SHA-256: cb32863a3148366159aad54d16eea2ae7dba0bf9a7778b79a80f66ded335ada5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary external URI points to a URL that appears to be part of a phishing or malware distribution scheme, disguised as an answer key. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/pbw?utm_term=icivics+answer+key+limiting+government
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5fd31cb878ce0.pdf
    • https://cdn-cms.f-static.net/uploads/4446502/normal_603955ec5cac6.pdf
    • https://cdn-cms.f-static.net/uploads/4370540/normal_6039aa1df0978.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_6028b1b171008.pdf
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/kizunop.pdf
    • https://cdn-cms.f-static.net/uploads/4374372/normal_606ad1fc1c353.pdf
    • https://cdn-cms.f-static.net/uploads/4413986/normal_602a59d67e7fb.pdf
    • https://cdn-cms.f-static.net/uploads/4489599/normal_605c613ae3b2a.pdf
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/rojurogalir.pdf
    • https://static.s123-cdn-static.com/uploads/4506131/normal_5fddd0afa1f68.pdf
    • https://cdn-cms.f-static.net/uploads/4453328/normal_60615e78a482a.pdf
    • https://cdn-cms.f-static.net/uploads/4501645/normal_602a127c64644.pdf
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fdee6c53860e.pdf
    • https://cdn-cms.f-static.net/uploads/4463286/normal_5fd918334baf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekipirunezi.pbworks.com/f/why_am_i_not_getting_all_my_freeview_channels.pdf
    • http://visetululiv.pbworks.com/f/73787370362.pdf
    • https://uploads.strikinglycdn.com/files/8c47c1d0-8661-4bc4-a402-c264b374ae00/lang_leav_books_list.pdf
    • https://uploads.strikinglycdn.com/files/0941700b-a267-442f-a3e9-968f46c70ec2/nelanopinuzupijokimibimes.pdf
    • http://garigor.pbworks.com/f/libro_sep_espaol_6_grado.pdf
    • http://gazumadu.pbworks.com/w/file/fetch/144434886/hasenat_hatim_2_indir_-_gezginler.pdf
    • http://xojifot.pbworks.com/f/how_to_reset_tzumi_sound_mates_no_buttons.pdf
    • https://uploads.strikinglycdn.com/files/041b56b0-379a-4994-9b78-120759c7e01b/fedelawerupibipufu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b57.bin
37c3508107d02471065a0303532bb483e2653bab1b42289756a4944af0bf02c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 5372 bytes
font_01_sfnt_off00012db2.bin
a7557942d8ec58167b0631f264a2c802855a4299357f8ada720cae448cd65e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 12276 bytes

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