Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba22ba849bada7f0…

MALICIOUS

PDF

183.3 KB Created: 2021-05-14 23:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5e2932cee00eea57e153de64db7957d SHA-1: bc4fea3638c8b35321dc4526cdadda745083a749 SHA-256: ba22ba849bada7f0b708157f2c5b68acacbbf3d73c434467b6d381a1e601d62c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=lightning+thief+summary+chapter+5 PDF link annotation
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/194848.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/vavatonem_mosevo_tojubusabezosox.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/ovarian_cancer_signs_and_symptoms.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/mekijup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5fcefb5f07bba.pdfIn PDF document text
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/416655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_606c7fe0a8c66.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/411b767f1.pdfIn PDF document text
    • http://nanolenka.xyz/kavozokalukirivowudivinqfkas.pdfIn PDF document text
    • http://znalomstvavip.site/school_community_relations_definitionlr1hf.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/90601533065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/segewirixawiradirojek.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/viwuparizegik.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/3609717693.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/kitchenaid_artisan_mixer_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/jai_ho_tumhari_bajrangbali_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/merriam-websters_vocabulary_builder_newest_ed_completely_revised.pdfIn PDF document text
    • http://lolunoxij.myartsonline.com/jitisudotonudasulesep.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_off000295d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x295D2 5564 bytes
SHA-256: 74120930eb4defad2f3208890c604f53f5d6b7882987ece0085c0e8215b63e7d
font_01_sfnt_off0002a8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A8B1 11376 bytes
SHA-256: a67c276076eb8e4354962dde9f2979911989489903e6d6096a16430c29e5ba69

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