Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a996669c5be39eb…

MALICIOUS

PDF

84.8 KB Created: 2021-03-24 06:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1357ae692482deb3c08fd1fa3798dc61 SHA-1: 5819f88910f658f16b01ab15902037c636921a4d SHA-256: 6a996669c5be39eb5a817e9162b20a6c7a98e64c202c1a3b491558ea2b6766aa
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosted on services like Weebly, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate redirection.

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
  • 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://midufefew.ru/award?keyword=bahnw%25C3%25A4rter+thiel+analyse+pdf PDF link annotation
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/7561926.pdfIn PDF document text
    • http://fastpysystem.online/puxoxesigavelegalitaju5lom4.pdfIn PDF document text
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/1794084.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/sirijirilota.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/91c625b2f3175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_60280d7f80b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_6015e7f889753.pdfIn PDF document text
    • http://pop-marketplace.ru/xebexapititelamibf69l1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_6f749e71b36947d1b6713f46f27b4277.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_10a1f911a25f4389ba722dbb85bc248b.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_682bae8a189a472abec320d5aa60bdde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c385c3e-9ba0-4925-a63b-424ebfdd5ac3/desudotofinevele.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/lettering_template_design.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_7e1eb5f592f04d799cebe9cc8f0a6ccb.pdf?index=trueIn PDF document text
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_bf0ca20e1dc6409dbb6879036ec3ff8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e041c61d-8de7-41c7-875a-30d722837042/how_to_apply_for_pregnancy_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1efc0f-d3bc-46c0-8991-b174a00d15d9/how_to_have_multiple_sources_of_income_as_a_teenager.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/alarm_clock_for_windows_8._1.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_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 5608 bytes
SHA-256: e58ad251b0a43f3073f784642b1b3295b7fadd0529b2a4f0f1296b089cf94fb5
font_01_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 11916 bytes
SHA-256: b4acbbf0b7e8ee645093a83f2c0590cef5dad44f52ed00a05a15810c6f420290