Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b9180753d0715d…

MALICIOUS

PDF

73.0 KB Created: 2021-03-24 19:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aad1841cb09b7fc1728104713c5d2e4e SHA-1: bd256b927041c9129ef0c7aa27fd85ad755819d8 SHA-256: 50b9180753d0715d40debe7f512f0d2bdc8868ea4bd483c7dc5c2f6796a7e42e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational material, likely to trick users into visiting the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/wix?keyword=chemistry+unit+4+worksheet+1 PDF link annotation
    • http://upgrade4me.com/cdrl_fillable_formg7y3j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5fda8e4e54540.pdfIn PDF document text
    • https://taduravepe.weebly.com/uploads/1/3/4/7/134714340/9388087.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/jesus_bleibet_meine_freude_piano_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_60037a056b62d.pdfIn PDF document text
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/8227965.pdfIn PDF document text
    • http://bit7.top/785012438349atc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_5fdc7b2cb4ba5.pdfIn PDF document text
    • http://legibovusapezo.mypressonline.com/tukesifigazat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60498054dc120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_6038308e1ff76.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/vaxuw.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/kumazupopositalifig.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/61604666015.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/44265217892.pdfIn PDF document text
    • http://erogan-oficial.site/bose_remote_control_app_iphonernqg5.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/harvard_classics_shelf_of_fiction.pdfIn PDF document text
    • http://tosety.xyz/affiliate_marketing_guidejd1vp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wudazebej.atwebpages.com/gn-4w-s-12g_eco_drive_price.pdfIn PDF document text
    • http://fadezanunadafik.myartsonline.com/lct_208cc_engine_manual.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/26309591625.pdfIn PDF document text
    • http://lufopudizomuv.atwebpages.com/how_accurate_is_the_masterbuilt_meat_probe.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_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 4988 bytes
SHA-256: b8bae1a15ad02353716abe5aecad046ab145900bfc4cfde9677ae3b5474bd678
font_01_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 10464 bytes
SHA-256: 94c6a81ff3f6879fe6276634905bfacdd5705bce1297d94a1c993b71dfd2bf33
font_02_sfnt_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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