Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36e205ea37b75dd…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 06:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e7662a44458cfd4ebaef21e4c7ae836c SHA-1: e1cca34f10aa3d7e288ed1568e017f00851aecb9 SHA-256: c36e205ea37b75ddd5042444071ad9ac663e971f11e9ce86dbd826c2a63d5096
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, suggests a lure related to 'making a bat house', which is likely a pretext to direct users to malicious URLs for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=easy+way+to+make+a+bat+house PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376120/normal_5fcbd8cf4330d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_5fd7867a6463b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375210/normal_5fec2d21d52b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6016fe9281ed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_6018dec039077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465905/normal_6022da9779994.pdfIn PDF document text
    • http://golosa-spasibo.ru/grass_mower_service_near_mezeitc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5ff28c2022e31.pdfIn PDF document text
    • http://vvinorama.fun/dell_latitude_e7450_battery_price6zgo5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_5fe66a488b03e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_6008e1ef64cb5.pdfIn PDF document text
    • https://kigotofu.weebly.com/uploads/1/3/5/3/135323523/sodikegavalubodavola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_601bf59031c27.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/tizipajawuvolar_denabenebu_jewupiz_pinuzog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_5feff7ea3adab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_5fee0ecf2f737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dumupa/fugulakosoxoxininon.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/28643264774.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/6723236756.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/car_loan_emi_calculator_excel_sheet.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 5152 bytes
SHA-256: 37cb3ba9ca81e4dc82ea00f94bafe8dc0c419a26fa438032f6faa758c44bf88a
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 11012 bytes
SHA-256: ed6c5deff4e8b6e9f8f813d79f1a34e4da0ff142c85aaafe95921646de11cc27

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