Malicious PDF — malware analysis report

Static analysis result for SHA-256 1685843b8b51ff1f…

MALICIOUS

PDF

115.3 KB Created: 2021-03-13 22:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0847d281128a4d794d9eeab47d627893 SHA-1: ccca49f33139b2fa370e622beb2c4287a5019d56 SHA-256: 1685843b8b51ff1f62d4c93417e8c76a9b7e916a3eda554f991bb3c87a35941b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://botokaw.ru/wix?keyword=a+woman+without+her+man+is+nothing+meaning+in+hindi PDF link annotation
    • http://tefulen.iblogger.org/treatment_of_hospital_acquired_pneumonia_guidelines.pdfIn PDF document text
    • http://sixegonupujuj.22web.org/34135890979.pdfIn PDF document text
    • http://jufawet.iblogger.org/neoclassicismo_architettura.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/kosobu.pdfIn PDF document text
    • http://kesenirevapovid.iblogger.org/netflix_for_smart_tv_android.pdfIn PDF document text
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/1395330.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/nufebir-wimosovepilok.pdfIn PDF document text
    • http://juzibekemuvur.iblogger.org/vojidedojabejijubir.pdfIn PDF document text
    • http://mibenovapus.22web.org/what_kind_of_oil_for_honda_1000_generator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_faa5b349811e403699a8b71487b4cb58.pdf?index=trueIn PDF document text
    • http://tebexuvizo.rf.gd/invisible_inc_trophy_guide.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_440d21037ef5498cafb82ba979f51392.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f24f13-e9c2-4edc-b4cc-b634d9ab70de/televozoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024add7f-dfd3-4e32-96e8-915c327e73cd/depisejab.pdfIn PDF document text
    • http://bokatamekal.rf.gd/civ_5_harald_bluetooth_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a222326-00d4-480a-998f-945fd14bf1a5/29027566078.pdfIn PDF document text
    • http://ruxopagotar.epizy.com/48856630741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12854340-c377-4ca3-9f4c-1d6c115295c4/walking_dead_graphic_novel_ending.pdfIn PDF document text
    • http://bobitemobo.epizy.com/cerita_rakyat_adalah.pdfIn PDF document text
    • http://xevorerokune.epizy.com/pruebas_ser_bachiller_2018_costa.pdfIn PDF document text
    • http://nadutalafex.rf.gd/how_fast_can_a_50cc_moped_go.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_d3094b39da97498b9a1a01cbf7763cdb.pdf?index=trueIn PDF document text
    • http://mevusajilitum.rf.gd/platform_picture_ajay_devgan_full_hd.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 11080 bytes
SHA-256: 95fce7caef8e80db19e8ae2ecdf190158aa806a7ab7a5d51de4da11d543e7490
font_01_sfnt_off00014d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D04 5168 bytes
SHA-256: a0f83f6687d0e59c183f144e298151653606ba3fdceecec516b933eae0ddf798
font_02_sfnt_off00015e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E63 3772 bytes
SHA-256: b9b49a3c453c53986d7a61d4291ac5a87065d82ff96be43ef0dca6427e6dc540
font_03_sfnt_off00016a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A07 14728 bytes
SHA-256: 04f504c37a8eb2b1d69c77c57bf927b6b6f3610baecafb84018491e93d3f843d
font_04_sfnt_off000199b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B8 16720 bytes
SHA-256: 7793ffeb94c544217d0359bdbe5089dd0544f578371a82022c114d5ded372746
font_05_sfnt_off0001b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0F9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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