Malicious PDF — malware analysis report

Static analysis result for SHA-256 78444b9fae68d3d9…

MALICIOUS

PDF

87.8 KB Created: 2021-03-30 18:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d93d89de42985347601262be87f6ec84 SHA-1: a9253e09e709bd95494444a2500b30ce705323e0 SHA-256: 78444b9fae68d3d92561c4128652c34260dad00860f409a71b3e626ad35f097a
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'integers in real life situations worksheet pdf', suggesting a phishing or scam attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=integers+in+real+life+situations+worksheet+pdf In PDF document text
    • https://pudexaxetodeli.weebly.com/uploads/1/3/2/6/132683251/4131356.pdfIn PDF document text
    • https://vavunoruluso.weebly.com/uploads/1/3/1/0/131070491/bagejodavamibe.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/samsung_vrt_plus_washer_code_dc.pdfIn PDF document text
    • https://movuwopolujot.weebly.com/uploads/1/3/4/2/134266044/3621712.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/jfsheVv/fedowexunuwizimegowiselaz.pdfIn PDF document text
    • http://begdas.space/727628408760h2or.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/eDjiohj/negogopukanavup.pdfIn PDF document text
    • http://espacecmb.xyz/35028735080wrej8.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/fegaxawebaba.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/492675.pdfIn PDF document text
    • http://new-leggins.site/whitfield_pellet_stove_troubleshootingxznvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woranuganavot.myartsonline.com/los_protocolos_de_los_sabios_de_sion_casa_del_libro.pdfIn PDF document text
    • http://ronaxunejononot.rf.gd/63627255108.pdfIn PDF document text
    • http://gevorewububew.epizy.com/game_basara_2_heroes_android.pdfIn PDF document text
    • http://rebopugosive.rf.gd/michael_crichton_timeline_audiobook.pdfIn PDF document text
    • http://taliwugoj.rf.gd/ropuzu.pdfIn PDF document text
    • http://pesafitibum.epizy.com/waverley_school_sixth_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 5396 bytes
SHA-256: bc7a83f6e6b54c4f0e5e4ec9d7a8c5ee28f91366a15c3ede627246a0c9ce7777
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 11804 bytes
SHA-256: f18cf1eddd9c9356a9b0995c8e8b2f69ae9704a2eebdf2796bc9823a637a889c
font_02_sfnt_off00013b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B33 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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