Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0a01814da73e34…

MALICIOUS

PDF

83.5 KB Created: 2021-02-22 23:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5d0a2d9afa932f683107880506d2cdd SHA-1: 68a186e4c70fae7ad3d1723be56eda1af2fc0a7f SHA-256: 4b0a01814da73e347568443962230dcf404b000c06e207f3d242b1efbfa36277
156 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. 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 0.9998

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://jottigo.ru/strik?utm_term=how+to+thread+a+brother+sewing+machine+xl-5130 PDF link annotation
    • http://sebekeruxa.iblogger.org/how_to_fix_roku_remote_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_600a561b17025.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/MveTieV/pabajafugide.pdfIn PDF document text
    • https://tatefazaseg.weebly.com/uploads/1/3/4/0/134016926/9abb70d5af7.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/jajd3G1/xigolilomawofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_600fa8c8461ad.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/d1Ojggj/unicorn_flashlight_led_conversion.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/gagotaniwipure/code_128_c_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/85262521830.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/12702849385.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/casio_fx-260_solar_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/bangladesh_air_force_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/besujavebajepokodas.pdfIn PDF document text
    • http://zosonigileg.rf.gd/sony_tv_aahat_serial.pdfIn PDF document text
    • http://vixabediwudofi.epizy.com/nihongo_sou_matome_n3_choukai.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/kodelodutevi.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/80567736060.pdfIn PDF document text
    • http://ledojiwibobuva.rf.gd/37428634518.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_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 6128 bytes
SHA-256: 5db52e7eebfeceeb7651661bebd15cd0affa4a1bcd252e884e296d20dc20f39a
font_01_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 10476 bytes
SHA-256: a672a441c0c407e3282dd754fc30026ebee6a39922424426d8b395cce484694a

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