Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a82be5b2681adb…

MALICIOUS

PDF

104.6 KB Created: 2021-03-16 21:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 81e9effdbe72699ff0876f0d6c8eb910 SHA-1: 6beaefa83601aab2950b5472f24d3ca075dbe5f9 SHA-256: 15a82be5b2681adb742eafc9518157c48135034b8f8014b2ae08fa1fbe94979f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a pretext for directing users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+light+therapy+works+for+jaundice PDF link annotation
    • https://cdn.sqhk.co/bujavenizake/6thbqYE/new_heavy_duty_tractor_pull.pdfIn PDF document text
    • http://botodowur.iblogger.org/manualidades_con_papel_higienico_flores.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/colt_ar15_pistol_lower.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_60499827c5b02.pdfIn PDF document text
    • https://xupumoga.weebly.com/uploads/1/3/1/1/131164417/67c375eb58599e.pdfIn PDF document text
    • http://fibaratibe.22web.org/kizigavidasewelo.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/bttidgf/vowodenisamorobusezeg.pdfIn PDF document text
    • https://vitigamonewus.weebly.com/uploads/1/3/1/4/131406732/biwuridiroxeditu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5ff8edfcd8806.pdfIn PDF document text
    • http://feviziwomuta.iblogger.org/wupelobesavudijen.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/wagemewefotofasobufudiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_603cf56035078.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/tidAgfw/pixel_buds_black_friday_deals.pdfIn PDF document text
    • http://nutopul.22web.org/guitar_chords_boogie_woogie_bugle_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/dJJSQZn/25158547789.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/51523841751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepogevadapafa.atwebpages.com/edipo_rey_personajes_principales_caracteristicas.pdfIn PDF document text
    • http://medexode.atwebpages.com/59426508026.pdfIn PDF document text
    • http://vedumojaje.epizy.com/mulamadidujovudezomi.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/4731477884.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 8688 bytes
SHA-256: 15f6b111b34b16044212960d7345485c1fe75085056ce1ef9901bed6dba1bd3b
font_01_sfnt_off000157fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FC 5712 bytes
SHA-256: 230f6156ea769ad972afa844fce79b2b7d8d417919b6a91084f128681359c966
font_02_sfnt_off00016b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B86 12004 bytes
SHA-256: 75526364f5927a276581d88dc7ed1a4a92ed8c3add7bf995972435872c005077

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