Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fd3a1dc7ceaf00…

MALICIOUS

PDF

80.5 KB Created: 2021-03-30 23:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda6a5e7dd01898fa1df5c03b2fbf03a SHA-1: 5d5c2df296cd660a498af42f465379afb08d39cb SHA-256: 83fd3a1dc7ceaf00a7e78782c4b3ebbbf1a77a4f189b23ca7a371bef276f5697
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, references 'Harry potter and the philosopher's stone book chapter 14', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://jumiwimov.ru/strik?utm_term=harry+potter+and+the+philosopher%2527s+stone+book+chapter+14
    • http://vzroslyh.net/gibogoruzanovekakixisepuigqns.pdf
    • http://bukuminuwakub.mypressonline.com/taronademi.pdf
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/puvojukorunubidim.pdf
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/4f262a493.pdf
    • https://tuzigopidimeb.weebly.com/uploads/1/3/4/3/134320631/4721818.pdf
    • http://geosen.net/rolezagixasazoyj1bj.pdf
    • http://zabopibisoxe.22web.org/medical_microbiology_dictionary.pdf
    • http://xitawefavam.medianewsonline.com/gutilulap.pdf
    • http://zokoxakabu.medianewsonline.com/7870324097.pdf
    • http://liwitesuzemumex.sportsontheweb.net/the_book_of_life_cast_meme.pdf
    • http://nolaloboni.22web.org/32371166563.pdf
    • http://nubuxeki.scienceontheweb.net/tozetukukogofibapawuz.pdf
    • http://zunuruxeguxifi.mygamesonline.org/acid_base_and_salt_notes.pdf
    • http://ezfix.asia/43757974488yzbrb.pdf
    • http://kitukotobov.medianewsonline.com/colombo_development_plan.pdf
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/fa4c2d5c8ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wefalojinon.rf.gd/setikileputojidesu.pdf
    • http://dowafirowelumex.atwebpages.com/vegaxedegevivorezoja.pdf
    • http://zopusawonomiwi.rf.gd/48802513474.pdf
    • http://laxuzoto.onlinewebshop.net/the_odd_couple_theme_song_name.pdf
    • http://dudorotedebapoj.epizy.com/34412892127.pdf
    • http://noroxijarajumez.epizy.com/3966650660.pdf
    • http://sofibimibojas.myartsonline.com/17227523548.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe8.bin
2b7516872cee038e659302a261a2acc780b109d230892a105393161fef86ab47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 5604 bytes
font_01_sfnt_off00010efd.bin
646a5bf1e22955b4cb10dec3e75967f5cf758b8be8a4bdecde718bb8a235a441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 10920 bytes

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