Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6ec800fc69ec91…

MALICIOUS

PDF

87.7 KB Created: 2021-03-14 05:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 494aea1adde246da05a24bcc9f8cd7c1 SHA-1: 7fe4a12fcd8c98fe6089a0898d102fd3a688aee1 SHA-256: 4a6ec800fc69ec9119dbdaabb750fe8b018e7b18fa284baa18ae2b6dc5f5a086
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=simple+probability+examples+and+solutions+pdf PDF link annotation
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/399e8c.pdfIn PDF document text
    • http://midimox.getenjoyment.net/how_to_convert_midi_to_mp3_audacity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fdb2bafcc9d5.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/muwoxuri_dufolemome_vitovom_polowasolom.pdfIn PDF document text
    • http://dkmz1.club/82071781853kbavy.pdfIn PDF document text
    • http://qwonder.space/smadav_antivirus_2018_for_windows_72hhqs.pdfIn PDF document text
    • http://inter-kalinka.ru/broadchurch_netflix_parents_guideb7xrq.pdfIn PDF document text
    • https://jipujiro.weebly.com/uploads/1/3/1/0/131069764/a564780b5c7ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6045104d3a8cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcf294eb9629.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/217992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fcc48d5bcf1e.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/kemitil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_60048636749ac.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/dell_2415q_mst.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/ketamipupun.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/7159436.pdfIn PDF document text
    • http://trackengine.host/how_to_write_10_100_as_a_decimalxz1e1.pdfIn PDF document text
    • http://arboozfilm.com/haughtiness_crossword_answerskpk5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisufovofow.atwebpages.com/how_to_find_diablo_2_cd_key_on_computer.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_59ee247ff165469f95d9a6a5821f8d99.pdf?index=trueIn PDF document text
    • http://furunes.onlinewebshop.net/mupakop.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_32daf7aca167470b9c296547f3cdb785.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_b5c052c024fd456f9764d23cde7c7d71.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_b382745b521e4282b09e1f7bbd397538.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 5600 bytes
SHA-256: 06b6b03e323e9e06ee8dcd79d3fd8ef1a7f1899b0ded8314da7654f7ffd40bf4
font_01_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 11820 bytes
SHA-256: 7b6c7ca6f152c2d35bac2f67242187e00a7966782c3dd15779892b845dd7654e
font_02_sfnt_off00013beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEB 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841