Malicious PDF — malware analysis report

Static analysis result for SHA-256 9791a75d05462c74…

MALICIOUS

PDF

77.5 KB Created: 2021-03-19 11:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ddc96cf709f397f0d9b2a23cb693f158 SHA-1: b2b61f886eee069cd7af77ab746e57fe5533fcb1 SHA-256: 9791a75d05462c741a7a2eebb5ec0d158b6ef91ef06c7ef66e5764da3a531de1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=diagrama+de+casos+de+uso+y+ejemplos In PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/dfb80de383ccb6.pdfIn PDF document text
    • https://fupewipi.weebly.com/uploads/1/3/6/0/136091895/5622234.pdfIn PDF document text
    • https://legobunisazej.weebly.com/uploads/1/3/4/5/134501617/9bf4be840740.pdfIn PDF document text
    • https://cdn.sqhk.co/buzulexoxuve/egficus/43312519730.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/1000_sat_words.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/beach_boy_ardashir_vakil.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/63685954447.pdfIn PDF document text
    • http://luloxijemise.medianewsonline.com/54016428814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450428/normal_5ff116a6b0b41.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/how_to_make_a_specular_map.pdfIn PDF document text
    • https://siwevamad.weebly.com/uploads/1/3/1/8/131871433/zaforad.pdfIn PDF document text
    • https://mefusinumobidal.weebly.com/uploads/1/3/4/6/134679396/bakosumon.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/igfhhqz/all_country_flags_with_names_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/ege5Fnk/suvonobezi.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/56769597948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5ff05ba430956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_6022be3756e8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugugemo.atwebpages.com/jitunonukixofuxageko.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/facebook_messenger_lite_old_version_apk.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/alphabet_preschool_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/xitokurifozujatobikewi.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_to_track_interval_training_on_garmin.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/rca_32_inch_tv_1080p.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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 5568 bytes
SHA-256: cf2b06a1f34d4f10d888ae7116e2580cfd352a47074abe8244b503a0ac79a46f
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10424 bytes
SHA-256: 9bb82965e54fc7fc859c24af696583bd2745cc1248cc013818ece8e104882f7d

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