Malicious PDF — malware analysis report

Static analysis result for SHA-256 f524288160786af1…

MALICIOUS

PDF

74.2 KB Created: 2021-03-04 18:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27f683f6825baa661bc6b06d88465534 SHA-1: 1a1df967f19bd97128ccfd2f11d90adc3ed225cd SHA-256: f524288160786af1d7e06d72bf59c5e58c4c07a5474fca85484d4e7ab3daec20
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 0.9993

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://leonvi.ru/123?utm_term=what+are+names+of+guitar+strings PDF link annotation
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/991916fc37b39a4.pdfIn PDF document text
    • http://getodupelipod.iblogger.org/90487440317.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/gotokik-nobebitanoboda.pdfIn PDF document text
    • http://pimavegi.22web.org/automatic_car_parking_system_using_arduino_report.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/375b9614b4.pdfIn PDF document text
    • https://vetuvixix.weebly.com/uploads/1/3/1/4/131437813/dewinilolelovaz.pdfIn PDF document text
    • https://rosokejasos.weebly.com/uploads/1/3/1/8/131871530/rasitufufir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_a87bcb49e80e4c0c81581a7be0de3541.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_d8e027b283d743dca1bee763ea37fb02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/91658326518.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/zoguso.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/53036141079.pdfIn PDF document text
    • http://fopekexu.epizy.com/superannuation_transfer_form_australia.pdfIn PDF document text
    • http://mosaxigegikoza.rf.gd/8307059892.pdfIn PDF document text
    • http://baxodivol.rf.gd/free_resume_templates_students_no_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/pedororuxefazexelisuzog.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/camera_fv_5_mod_apk_free.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_a60e7a6b30fe4d8fa6c7160107cc42d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/42140675339.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/68136146545.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/mutinolozilabamavivuwiki.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/real_football_games_for_mobile.pdfIn PDF document text
    • http://bepogakebite.epizy.com/african_beauty_song.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_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 5160 bytes
SHA-256: d4fdecbe8e3511fe3cee1445aeb49d97ed5b45bed095d4500c4b6d572354dc71
font_01_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 10920 bytes
SHA-256: 240b535f9ef70c0938e6261e3246e76d6c7c1658bb7916b4803421bb54ff3562

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