Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5ac1e2b0f57ca7…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 10:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7ed9e5f12e5d89cffc5a62d9f50b1388 SHA-1: c86d0c293c91bc17ea9fa7284534e66523928f42 SHA-256: ae5ac1e2b0f57ca7ef857bc23af211bf84da0aa66baace331775238fbc704d1d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 of which point to disposable hosting or unknown domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a fairy tale title, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=blanche+neige+la+princesse+aux+sept+nains+pdf PDF link annotation
    • http://konujojijitezu.iblogger.org/characteristics_of_a_successful_project.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5ff7b8cbe0cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fd742ce9fb36.pdfIn PDF document text
    • http://xofazonir.iblogger.org/zotuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5fe05d253e69e.pdfIn PDF document text
    • http://patimezo.22web.org/heathkit_sb-200_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_5fe6f4e4d8348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5ff80d5f6f685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_604d2d70c7726.pdfIn PDF document text
    • http://kinatoguvekajux.22web.org/theories_of_international_business_ppt.pdfIn PDF document text
    • http://nudabozijojoz.iblogger.org/35588196925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_60434121242cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_601ccd211bd9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a4ad22-0a39-4e8b-b334-b8764a393364/social_learning_theory_gender_psychology.pdfIn PDF document text
    • http://vumafovixono.rf.gd/secret_piano_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b1ad809-eea3-4b87-9d78-b69015d08f8c/36037133687.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/ars_poetica_macleish.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/32006420900.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/psat_practice_test_2_answers_fall_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/funny_cat_video_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213fc019-56d8-48a6-bd81-28ab73ecd64c/what_is_the_most_advanced_math_in_the_world.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_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 5532 bytes
SHA-256: 20bbd66821b8f17cef069b1effcb08f33093696591c1055effa458ef3e9bb976
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 13668 bytes
SHA-256: f15669494ef3844125fcdfce9a059962b00ba6fe6abce9259908f464e2f3ee19

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