Malicious PDF — malware analysis report

Static analysis result for SHA-256 773bb03ba15afdf7…

MALICIOUS

PDF

77.5 KB Created: 2021-04-05 12:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ff7efbd7ffd677f371e1065b4106dd8 SHA-1: 9158de88214404fa9697389070af8d9719795117 SHA-256: 773bb03ba15afdf790827708167b7e242ec71b47b2a72b84f4bcb8e3fe2c6967
126 Risk Score

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 0.9997

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 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://bologen.ru/strik?utm_term=columbia+management+science+and+engineering+admission+statistics PDF link annotation
    • http://conicppjry.bid/jeep_wrangler_manual_transmission_conversion_kithzqkw.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/djhidgg/superhero_wallpapers_for_pc_free.pdfIn PDF document text
    • http://topagut.iblogger.org/sk_comprehensive_barangay_youth_development_plan_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/0gehiDH/gaming_hd_wallpaper_for_pc_4k.pdfIn PDF document text
    • http://mutalunepemaw.22web.org/75612875408.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/catholic_catechism.pdfIn PDF document text
    • http://vukifaralefer.iblogger.org/91948151732.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/frIJjj1/how_to_do_the_perfect_ice_cream_scoopable.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/KidluZK/switch_dashboard_theme.pdfIn PDF document text
    • http://gratoraama.website/lagu_the_chainsmokers_new_song_20174so2u.pdfIn PDF document text
    • http://sobuvide.mygamesonline.org/12411291369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biliped.epizy.com/48435467053.pdfIn PDF document text
    • http://vemaxuvigufu.epizy.com/does_fifty_shades_of_grey_have_a_part_2.pdfIn PDF document text
    • http://faletabud.epizy.com/kikesitizikuromijodiw.pdfIn PDF document text
    • http://zasugizej.epizy.com/kuzubikuri.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_95b46ac86f6b4feab917dcbe0e385866.pdf?index=trueIn PDF document text
    • http://mogadaf.epizy.com/email_signature_template_adobe.pdfIn PDF document text
    • http://tedumadedin.epizy.com/zugutetubirizezaw.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_8daa897eb7b34686b0cbf16285327289.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_74a96f5f27e34ac8a8569b626a02eba0.pdf?index=trueIn 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_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 5304 bytes
SHA-256: 5b55e326447d4c55e329154580c82bf88920dc4b75fb2dc8ef6e8c927e280a03
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 11604 bytes
SHA-256: 03a353bf93420862bae6b3a01a3fdc66378a6b1a2156ee9d1a24fd610cd11ef4

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