Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c507a74587a2822…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 00:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 01b6bd6158d967fb148d99e9dacc86a1 SHA-1: 2d3a1a3478605988b61ce9e800c7cd6714a4cef4 SHA-256: 4c507a74587a2822b6f24d8af8bc8ed35b1722a447ee596449cb0bf0433f3575
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of 'javascript' in one of the URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is designed to redirect users to malicious content, likely exploiting web vulnerabilities or delivering further payloads.

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://dugedepap.ru/award?keyword=javascript+return+reference+or+value PDF link annotation
    • http://forovasax.medianewsonline.com/wazib.pdfIn PDF document text
    • http://azorocheat6.xyz/bugezabufobepotaworetefouif4a.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/xamizafafev.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/1084502.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jeaKsfq/21675508043.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/eDcK7Fx/joplin_humane_society_phone_number.pdfIn PDF document text
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/fatelodoli.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/can_you_track_priority_mail_international.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jfhenjd/pinkfong_baby_shark_jauz_remix.pdfIn PDF document text
    • http://eglo.club/skywalker_trampoline_12_net48yi3.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/asus_rt-n66u_password_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5fd2d15320338.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/DjbK8jb/egg_wars_server_minecraft_pc.pdfIn PDF document text
    • http://detonic-de.website/neato_botvac_d5_connected_software_updatezrg8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_6017b3cb410e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudemexa.myartsonline.com/lyrics_charlie_puth_-_one_call_away_official_video_unknown.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/robert_kiyosaki_childrens_book.pdfIn PDF document text
    • http://gamelaluwer.myartsonline.com/79381693875.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 5060 bytes
SHA-256: 85f92abdf05a2ef83b32d76c4d982c34236f8a5b2fee79d8a5f867078adadff5
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 10300 bytes
SHA-256: 8e887f2c002dbb1dfb274916e22350fca6b3fb5e1609e104b88002047f0af13a

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