Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f9dd0e38c21c89…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 11:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f2e3f3c906bcbe7fedd43d18d6cc2254 SHA-1: 3481b77fcc0c0c614d6ee89f3872039747809ab9 SHA-256: 81f9dd0e38c21c89a88641bb5762bbcc1faba9cf1061404aad90af0f820fb04a
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 0.9992

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://xajibur.ru/strik?utm_term=marie+lu+legend+movie+release+date PDF link annotation
    • http://teksol.xyz/nisodp6q6g.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/48452546952.pdfIn PDF document text
    • http://instas.site/90890826169iol1w.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/10772065797.pdfIn PDF document text
    • http://daimontimur.org/adjective_forming_suffixes_examples6kjgj.pdfIn PDF document text
    • http://ditugivovuf.22web.org/56648836973.pdfIn PDF document text
    • http://fit-italy.space/contador_ascendente_y_descendente_flo5i4u.pdfIn PDF document text
    • http://bugiwuxad.medianewsonline.com/ambrose_band_of_brothers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_b7231e64f6a1461cb7a365e001a173ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/dreamweaver_cs6_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/understanding_file_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/lutedowomuwisupiwotufuzep.pdfIn PDF document text
    • http://wugetad.myartsonline.com/fevegumiter.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_240befc5f03c4abb842710200f3d748e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/getizar/38343162515.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/duxezidalagi.pdfIn PDF document text
    • http://jiridujusos.epizy.com/sura_yasin_bangla_translation_mp3_download.pdfIn PDF document text
    • http://zuputes.atwebpages.com/is_ghost_recon_breakpoint_beta_cross_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/introduction_to_embedded_systems.pdfIn PDF document text
    • http://bezexus.rf.gd/42555452618.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_edc237eb64b14b9db6b1d687b4227a8f.pdf?index=trueIn PDF document text
    • http://sagisat.rf.gd/73433775840.pdfIn PDF document text
    • http://xewaxal.epizy.com/82997243216.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/59044226095.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 5212 bytes
SHA-256: 884e930397570f50f052c073deb0572f4060121dea79ea6eae4c4f0b31ec2702
font_01_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 10948 bytes
SHA-256: 4d5e84aad950bce3e380dd769020b04e9dcfb2f99b5fc07f76c0715afd37e956

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