Malicious PDF — malware analysis report

Static analysis result for SHA-256 e796d8687e6b604c…

MALICIOUS

PDF

72.9 KB Created: 2021-03-24 14:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f37c899ef4167d3d33562464d97d514c SHA-1: 6753d2759f0e97388c2d76cb37eb6ea236265a94 SHA-256: e796d8687e6b604c31197e7ea39a852c5a30d24023fee0a9fc6fcd294a4c9a13
126 Risk Score

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. The document body, though heavily obfuscated, contains references to origami instructions, which is likely a lure to direct users to external URLs. The presence of numerous URLs, many pointing to disposable hosting and link farms, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=how+to+make+claws+out+of+paper+origami PDF link annotation
    • https://cdn.sqhk.co/nedupugifuka/ohbbidH/gusegezuvubudinibuxegevel.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/xitomad.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/evanescence_my_immortal_piano_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5ff23781bddac.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/RiiLtpZ/enemy_strike_2_game_download_apk.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/is_there_a_remote_app_for_samsung_smart_tvs6kuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_5ff69e8b449ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_603f3c3b2c266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_6024734e9d44a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424672/normal_60030ce6eae0a.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/the_idiot_box_spongebob.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/qQgfs7G/prenatal_microarray_reporting_guidelines.pdfIn PDF document text
    • http://naturebiolog.space/takigala27d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavatesivo.myartsonline.com/free_download_english_grammar_book_for_kids.pdfIn PDF document text
    • http://zozezad.epizy.com/allocable_surplus_calculation_format.pdfIn PDF document text
    • http://jafimelivif.rf.gd/postdoc_cover_letter_template.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/50422674822.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_32c01804cd4340f69d725e11c830e982.pdf?index=trueIn PDF document text
    • http://botefopidavowod.rf.gd/12618887495.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_2e6a725869e243e581aab1a9aca68ce8.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_9fb199111cbb4e30b7aee67fd75b457f.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_53caafa77db04807bc4b51fc177aa6c5.pdf?index=trueIn 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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 5452 bytes
SHA-256: fc83f9e181685b1c26a61fa1be77b83e5457fc526e8802e223c0ba64f758455e
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 10556 bytes
SHA-256: 0964a436bdeb541da39a27da3e649a5b2a4ba13629924d0b6b5fc925ba99bcfd

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