Malicious PDF — malware analysis report

Static analysis result for SHA-256 b972df9ada9301e6…

MALICIOUS

PDF

71.9 KB Created: 2021-03-11 00:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb39ad44f1a30258aaf8002d4795b17 SHA-1: 61eea45c167ec008d3756dfc9d0a175b24829330 SHA-256: b972df9ada9301e66be01ab138d114ee5860d4d29f88e5c2e4c2f502aec26b88
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=st+bartholomew%2527+s+primary+school+ofsted+report
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/kurod_kutejiligegemi_moxapipola_sixejode.pdf
    • http://dressnbuy.com/how_to_day_trade_for_a_living_andrew_aziz_download_freeog6pr.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/luxozo.pdf
    • http://twenty-promo2020.ru/wolfgang_puck_pressure_oven_manual4jfi1.pdf
    • https://vofitusu.weebly.com/uploads/1/3/5/3/135301199/073e18a.pdf
    • http://expressvpn.store/minecraft_apk_1.8_0.8_indir39d7t.pdf
    • https://revapukas.weebly.com/uploads/1/3/5/3/135323612/e4b9fc016977201.pdf
    • http://ygrash.website/nuxolez5d6u.pdf
    • https://nazisedisan.weebly.com/uploads/1/3/1/8/131871674/jowanunujeju_gatoge.pdf
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/1754577.pdf
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/8547621.pdf
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/2779d7fb93.pdf
    • http://fsbsiod.com/rosikelenyc927.pdf
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/kejibuwexo.pdf
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/rozewonulejixozab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vonutavekip/clinical_pharmacology_book.pdf
    • https://s3.amazonaws.com/muvazi/22440691747.pdf
    • https://s3.amazonaws.com/sezewu/chlorine_twenty_one_pilots_sheet_music.pdf
    • https://s3.amazonaws.com/fevobelijogal/notepad_6._9.pdf
    • https://s3.amazonaws.com/ronenitevodo/zogiv.pdf
    • https://s3.amazonaws.com/rakabexozu/mewazaxegez.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/3264783699.pdf
    • https://s3.amazonaws.com/solonebosop/97402395950.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d878.bin
ba026ef95c2a794334b0473d3ce27068b6c3052e6d906f7b4bac9e33740e0339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 5868 bytes
font_01_sfnt_off0000ec62.bin
e84e374aeb7a939dbc748bbd05e19bfa89a82ef5d76d3b7d0196467a6280112f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 10784 bytes

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