Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05dda5e823e7a28…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 07:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f9a6eb5ead193f2249b1666a2e14f08f SHA-1: 9ff7a4aa8f5d9c3ceda40d87bd7c1729fd60cc6e SHA-256: b05dda5e823e7a28b716e7429ded035b99580b589b391aaa0c5791ca9852e141
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirect to malicious infrastructure like 'yafferge.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=jurnal+asia+tenggara+pdf In PDF document text
    • http://kopuvimu.scienceontheweb.net/63283142778.pdfIn PDF document text
    • https://cdn.sqhk.co/jamosolil/g0Rjgki/download_marry_me_perfect_wedding_day.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/eEhdgiM/free_online_spanish_to_english_translation_websites.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/wakeduvafovetisubusulajeg.pdfIn PDF document text
    • http://shtangye.xyz/34236859694u97so.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/Wf7jeQQ/defence_application_process.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/jiLgcyM/ms_bike_ride_2019_florida.pdfIn PDF document text
    • http://antonioita.fun/gomafolapopikekiguu5sxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3034b99-0452-493f-8c58-488765f513b2/kindle_paperwhite_user_guide_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce68345-b6c6-45d3-a53a-ac2d238fb95f/omron_hem-711_error_codes.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_97e12ce7833248b6af90a04feafb3b32.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_503f6470eb184beca2c52b6e8dff907f.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_3cece98f60bb41e88aeb2de29145c06f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46d1a1b-3347-418e-a2d2-e8d54a47fa84/how_government_support_entrepreneurs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a1af6b-33e6-477e-a7d1-144d6c1e0133/33796272203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78de8879-58ef-4781-8362-8f6e33802efc/zawazivututo.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_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 5200 bytes
SHA-256: 373ef3211e6cb8f05ca344ead039e2786dda1a80ffb5381a83e19f35625ca1ac
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 11852 bytes
SHA-256: 09e8966eedbb712c0b8727471ebd06ed8e779f1294566d9bc9f326ce81dc6541

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