Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfbc71c84692b4c…

MALICIOUS

PDF

69.9 KB Created: 2021-03-27 21:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4a9aeeb951e20dfa8d4bc92c1dfc7a62 SHA-1: 5a6294e98ee7116ff481a99ca3eeb7c1c612ba38 SHA-256: abfbc71c84692b4cda301969116a56eb041a05c8cbe66bc0ab408fc00acb47b0
216 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses brand-impersonation credential phishing. 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 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/161d29bbd25ca6f.pdf.
  • 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://golowaki.ru/award?keyword=acca+f3+practice+questions+and+answers+pdf PDF link annotation
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/161d29bbd25ca6f.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/pack_leader_pet_services.pdfIn PDF document text
    • https://mafizawejibon.weebly.com/uploads/1/3/1/3/131383772/2172621.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/1860941.pdfIn PDF document text
    • https://nivewasivok.weebly.com/uploads/1/3/4/4/134479385/7741920.pdfIn PDF document text
    • https://kisezuxuromo.weebly.com/uploads/1/3/0/7/130776201/730862.pdfIn PDF document text
    • https://dogewirezuv.weebly.com/uploads/1/3/4/6/134699505/4659128.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/9a4d8b.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/2464401.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/lixevakikiput.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/piwanisaj/classroom_pronouncer_guide.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/posidig.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/how_to_simplify_algebraic_expressions_with_like_terms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e5741f-3cc8-45e2-96d7-4083a23eb265/jam_hang_up_portable_bluetooth_speaker_review.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/whatsapp_for_android_2._3._6.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/how_to_fix_ge_washer_start_button.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/21443438704.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/muslim_baby_boy_names_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/kindle_d00901_will_not_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/new_york_yankees_news_bleacher_report.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/wanimifawixuvunefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da65ea4a-1b57-45a1-bea6-cab20568c099/home_delivery_meals_for_one.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/8488637827.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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 5488 bytes
SHA-256: 749305a258522f80b79216d0836a3c5276b6c460ea0168364149d1e4450bd595
font_01_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 10520 bytes
SHA-256: 3487d5dcc3cb127ea3fd9fca8963f5597e412630adc4aa9055cbc2dee98ca3ac

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