Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8836d469117ce1d…

MALICIOUS

PDF

105.5 KB Created: 2021-03-03 03:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 688c9d18f5a31c8e4576ff5571b4e7a7 SHA-1: ac1824eb76d8ff41d2b7889f6dddc35e1c9901dc SHA-256: a8836d469117ce1d36d8b10331b2f1fe9d44799827de3e772155288ea3d7ae16
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

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://baarspo.ru/wix?keyword=magnetek+pool+pump PDF link annotation
    • http://linorusani.iblogger.org/ergobaby_omni_360_baby_carrier_cool_air_mesh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493209/normal_5fdcdc0033f81.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/pivefe.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/80731575155.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/b5728c4d61.pdfIn PDF document text
    • https://salapabozob.weebly.com/uploads/1/3/5/3/135326799/c41927a00c690b.pdfIn PDF document text
    • http://lokalumamone.iblogger.org/jawikarobukugafawepe.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/what_is_a_ul_certification_mark.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/t2yugi0/77244813491.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/egcOV2x/alone_status_for_whatsapp_download.pdfIn PDF document text
    • https://nopuwujipa.weebly.com/uploads/1/3/5/4/135400678/nubidib.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/the_real_christmas_book_bass_clef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/best_books_by_brandon_sanderson.pdfIn PDF document text
    • http://nudenagazosizav.epizy.com/septanest_articaine_safety_data_sheet.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/does_gamestop_ever_have_coupons.pdfIn PDF document text
    • http://wazilopuwifelig.epizy.com/buzaxukugurazu.pdfIn PDF document text
    • http://nozosikela.rf.gd/harvard_reference_style_format.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_off00015dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDE 4936 bytes
SHA-256: a95ca3a9dcba28709d0e5b64da64b3a7bb8622ee161b75ba3286c983d707043a
font_01_sfnt_off00016ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAD 13260 bytes
SHA-256: a2c4a1a97d04553ef19ce9abd553a492b7ad8c15261c24f3056e295f9673d1e8

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