Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4246ef862c0644…

MALICIOUS

PDF

65.6 KB Created: 2021-02-20 04:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b32e2016a7b4b4f41493d4a8a077c5eb SHA-1: bde388699f7d3b5d5d5115d4a146ca1a8495641c SHA-256: 7a4246ef862c06444447874074e0ba1f6e41b43aac68c9bf35f8adb77deeca7e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm or SEO spam campaign. The document body, though truncated, includes a search query, suggesting a lure to drive traffic to these external sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=how+many+calories+in+a+strawberry+jam+donut PDF link annotation
    • https://fumadutukit.weebly.com/uploads/1/3/1/4/131437402/8657f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/ZR0KUjc/zombie_wallpaper_4k_live.pdfIn PDF document text
    • http://tozepefaj.iblogger.org/bofeg.pdfIn PDF document text
    • http://reestr.site/bapolilivesiwerilakz8xe.pdfIn PDF document text
    • https://zabosete.weebly.com/uploads/1/3/1/1/131164473/2feccc668961d.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/loxuk_fawikare_kisolorowibux.pdfIn PDF document text
    • https://kofetasug.weebly.com/uploads/1/3/0/8/130874362/258720656.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/jgAjdqW/nick_cordero_waitress.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/611pjdX/ikea_burbank_long_lines.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/3phfsJh/digital_marketing_courses_online_free_with_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/GBwhggq/dental_assistant_monthly_salary_in_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/hQuieUN/las_vegas_santa_run_2019_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/Fii3n8I/100_hits_rock_n_roll_love_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/jihXgjc/bubble_hero_2_pc_game_free_download.pdfIn PDF document text
    • http://fepotarugagi.22web.org/zuwanovav.pdfIn PDF document text
    • http://hustlinmoney.com/los_espejos_venecianos_descargarlxecp.pdfIn PDF document text
    • https://fulesinarube.weebly.com/uploads/1/3/4/7/134729099/fufigik-bomevejasolide-mafixov-zovexutepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujoponax.epizy.com/berrisom_sheet_mask_review.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_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 5456 bytes
SHA-256: 08b094953704b524bb659ba748bf20b6e69fc2a01e31121c3ee1d16d069b4784
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 10484 bytes
SHA-256: 203250588a3327121351bdfc351087673f817e2ce984cb5fd3d02f65507798a5

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