Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58791bedf81146b…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 22:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7f60a42c894183165c998235809a63d SHA-1: 2fe5512dc344f638d18d76bbc9c460f66c30132a SHA-256: a58791bedf81146b24b871c54c3c697ccde71e8b6a2abc08ea37196d13fe5b19
156 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 0.9995

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 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.
  • 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://crophysi.ru/strik?utm_term=how+many+calories+in+a+wendy%2527s+dave%2527s+single PDF link annotation
    • http://vipimuxatomefi.medianewsonline.com/74608333454.pdfIn PDF document text
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/roresepati.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/1357955.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/sidutosufuwodofibapejaf.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/jggiHYl/cadet_college_hasan_abdal_challan_form.pdfIn PDF document text
    • https://cdn.sqhk.co/wasusoguba/ig4hVOt/fekinulewawojavakijagun.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/F4ibaCz/dents_de_lait_traduction_en_anglais.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/tobixa.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/IhafJOP/survive_zombie_apocalypse_weapons.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/mikuribusodejid.pdfIn PDF document text
    • https://nonejazusedebe.weebly.com/uploads/1/3/6/0/136099570/2912847.pdfIn PDF document text
    • https://cdn.sqhk.co/wijugilom/RAIIZjg/c_v_format_for_job_application.pdfIn PDF document text
    • https://wibawewema.weebly.com/uploads/1/3/1/3/131398479/2c904bf1bf.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/giidjhS/53223559187.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
    • https://s3.amazonaws.com/tuletivotarupu/10996422729.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/multiplication_games_4th_grade_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/bike_games_3d_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/geometria_analitica_vectorial_figueroa.pdfIn PDF document text
    • http://zedebegeku.myartsonline.com/afspa_jammu_and_kashmir.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/agent_carter_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/critical_thinking_worksheet_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/tp-link_smart_plug_hs100_homekit.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 5216 bytes
SHA-256: 4a4f53f2246fd235f5787e834a9fc4274d3660c3e57f7d0e0bdc3ef90d3d6f73
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 11132 bytes
SHA-256: 2bbc88ceb2802ea5a2f99e26d02ee8aae586c42a61655c06047d7eb3bc948d18
font_02_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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