Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c41ebcdbb52fb4…

MALICIOUS

PDF

77.1 KB Created: 2021-03-04 18:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 33c4358b0b1641da4a6f812bfb3fcdfa SHA-1: 0f829496dd30867d1c3521e8ccf4ae4dd993b1d2 SHA-256: d5c41ebcdbb52fb4b38e2bc2e9f9ee786f277f5fd8f3d255bccae6565cb55b5b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to social psychology, likely intended to trick users into visiting the malicious sites.

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://seumenha.ru/wb?keyword=an%20example%20of%20social%20psychology%20in%20the%20real%20world PDF link annotation
    • http://linavaluviriv.getenjoyment.net/86179978148.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/3534966.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/nuwusalasobaneropaxaf.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/free_willy_1993_whale_name.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/iaKjgjf/tawaforutenojapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5fc588c1d882b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fdbc05448c0b.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/iRigHhV/helplessly_hoping_song_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5ff767529fe98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5fd821cd827b9.pdfIn PDF document text
    • https://vuvugero.weebly.com/uploads/1/3/2/7/132710729/kazojaruzalabup.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/jhcjcIX/newest_call_of_duty_for_playstation_4_bundle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusebirenox.myartsonline.com/prefix_and_suffixes_exercises.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_4bf1cfcc18074e2ca0991907d01b1690.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_cda41acf5ac745c1b5c6f8b27df56fc9.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/websters_third_new_international_dictionary_unabridged_online.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_b2ddfe0a926340ee8e2f6cda56f4e990.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/persona_5_competent_negotiator_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/anniyan_movie_cinemavilla.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/dibotoxorutu.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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 5820 bytes
SHA-256: 42e3d6aed4dc07a1973fa3ca1a20580cdfc773b723a18cc046525ec4adb776d3
font_01_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 10672 bytes
SHA-256: 491bc7c03db375d3bc690fa4d23e9d1f2cb0547e8f6ca48b703c600cad67d12f

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