Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc813bfc1a12b0a4…

MALICIOUS

PDF

75.2 KB Created: 2021-03-31 08:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 71fc11fe7ff2cd4af70efbe360fbd594 SHA-1: 95ad858aa24e09dde687ad123057d331a3c5e29e SHA-256: cc813bfc1a12b0a4ac9ddfc492e61056bba6024e565fb6ea0487e2898eeb316d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://ponafet.ru/123?utm_term=ielts+fever+listening+test+pdf PDF link annotation
    • https://cdn.sqhk.co/letaziseb/ifEji60/55958831821.pdfIn PDF document text
    • http://suxiselukex.66ghz.com/memujetonewixojedufugi.pdfIn PDF document text
    • http://arendaavto.taxi/spelling_power_grade_7_answer_key_lesson_3ydry5.pdfIn PDF document text
    • https://cdn.sqhk.co/niturunajik/ig8igUv/89299539056.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/star_trek_voyager_castnmv9r.pdfIn PDF document text
    • http://nozozofodedeza.iblogger.org/pepirogidavupevezod.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/maneburikojuwaxotawida.pdfIn PDF document text
    • http://maddot.space/88710826734v91w4.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/4jb4ha5/auditory_verbal_therapy_and_practice.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/ganesha_atharvashirsha_sanskrit.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/55729400887.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/cfop_is_the_best_method.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dikazimizoban.epizy.com/electronic_devices_and_circuits_by_j_b_gupta.pdfIn PDF document text
    • https://2108ee29-f41f-4224-afb3-8e24ca2f7712.filesusr.com/ugd/279473_89a86d037095443eace731d9305ecd48.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_4dbb28239f8c4a1489ae3a02efd233fc.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_c61740d1ca92427189048652393f7dff.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_6b3a500d0acc42dd8f3889660fd883d5.pdf?index=trueIn PDF document text
    • http://rifunasi.epizy.com/33819745618.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/zinimogavawojofesa.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_81ac4b243a3b4aaab914d5cac50bd801.pdf?index=trueIn PDF document text
    • http://vovuvap.rf.gd/raximix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 4672 bytes
SHA-256: 3cbe7b2cea62665dc492e6d308310a1d7fd64fbdcadb1bfeb0e26c86f79e79f9
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 11136 bytes
SHA-256: a33aca2a9b9e94bd11055e95e09544291c35faf92b25fd860cbe91c5d6c5831b
font_02_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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