Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4cc345ebf76d61…

MALICIOUS

PDF

74.4 KB Created: 2021-03-19 23:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d89a7e6466f7d06b383be875ec183432 SHA-1: 9fac161a4d9f474cae6c3b49ed92e1d5188d4ad7 SHA-256: 8b4cc345ebf76d61b7ce6f53d1bf1db53b386afa664f83ee60f9f417b3569f0b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=maquina+de+escribir+brother+gx+6750+manual PDF link annotation
    • http://dezuforupom.iblogger.org/chhota_bheem_cartoon_images.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/sukukibo.pdfIn PDF document text
    • https://fepapiwepum.weebly.com/uploads/1/3/4/3/134382013/a8c383a.pdfIn PDF document text
    • https://xijadusulotogu.weebly.com/uploads/1/3/6/0/136089771/duwojeviw.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/8473333.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/a879391b20f2cb.pdfIn PDF document text
    • http://natewisuwosat.iblogger.org/11331017942.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/a4f0c68c6dd8e.pdfIn PDF document text
    • http://zipimenegan.iblogger.org/american_history_timeline_1900s.pdfIn PDF document text
    • https://lujovimujesami.weebly.com/uploads/1/3/4/0/134019161/417397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/22598230512.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/68341380178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1101462f-295e-4cc2-8953-7c663ee471cb/eotech_512_a65_problems.pdfIn PDF document text
    • http://nesitobika.rf.gd/update_huawei_p9_lite_to_android_8.pdfIn PDF document text
    • http://sijeviveb.epizy.com/bikini_body_guide_1._0_free.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/beetv_apk_fire_stick.pdfIn PDF document text
    • http://topagujowulefe.epizy.com/tawuvus.pdfIn PDF document text
    • http://vaterojot.epizy.com/how_to_reset_a_samsung_tablet_if_you_forgot_your_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d0fbe1-9d37-4d1a-986e-6ea607554261/fodufir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aaaac7-e292-4f8a-a197-3cecce6710e8/online_masters_degree_in_mechanical_engineering_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede13401-2e23-4959-9f55-13f3750a40fc/what_does_integrated_headset_mean.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_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 6192 bytes
SHA-256: 721e657efecd5555859e082105cac65291741edece4052f01a0dc17185afd87e
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 11684 bytes
SHA-256: 26f2d0c54a15a6f3cf78487b02d0ea63fd3ac94f5cf3228f0259271d59e53d2a

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