Malicious PDF — malware analysis report

Static analysis result for SHA-256 836ce2d2b0dbc9ee…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 10:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a09deec7ca71c927ac3d236d13c005a9 SHA-1: 9c82ec8775190baea75d9edd1f13433b8ca72710 SHA-256: 836ce2d2b0dbc9eebe7a545c0b3f1922b1ab1476ff95e510ee542336c2633106
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://crophysi.ru/strik?utm_term=what+does+the+word+species+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff88ee7083a8.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/jggdiej/gisuvutagopexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_6033392ecbdaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407301/normal_5fef0c22d427f.pdfIn PDF document text
    • https://vubovomezalifis.weebly.com/uploads/1/3/4/5/134511152/8524648.pdfIn PDF document text
    • https://tigopovon.weebly.com/uploads/1/3/4/2/134235173/moduji.pdfIn PDF document text
    • https://bafejaligaxe.weebly.com/uploads/1/3/4/0/134018432/gukinitifeja.pdfIn PDF document text
    • https://gajerekore.weebly.com/uploads/1/3/5/3/135327587/6124957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_601554aad28d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_603ef47a759cb.pdfIn PDF document text
    • http://wubosilafusim.iblogger.org/gazimurubop.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/UQy8jdy/determinacion_de_alcohol_etilico_en_sangre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://durumam.epizy.com/ipod_nano_7th_generation_storage_capacity.pdfIn PDF document text
    • http://gemenija.epizy.com/sports_illustrated_magazine_cover_this_week.pdfIn PDF document text
    • http://lapefub.epizy.com/good_free_messaging_apps_for_android_phones.pdfIn PDF document text
    • http://xufenazaliwe.epizy.com/99783134589.pdfIn PDF document text
    • http://nasedelowose.rf.gd/23246956110.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_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 5384 bytes
SHA-256: c627a42021c4b9d6323802e662e76cd1683a05248b7ecd900ec65268580c89a3
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 10372 bytes
SHA-256: 82d30b454acaad8fa67187bfad2203e99a1500f8ca16c772e54a740252ea5579

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