Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e79184f5d3910c…

MALICIOUS

PDF

88.4 KB Created: 2021-05-25 01:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8b8094b145f123d9ae0212a2fccb87d8 SHA-1: e37e8a8cec9f60c68e8075890f8c2f2e94e577d3 SHA-256: 44e79184f5d3910c3b2e8d6223f9f682ed8fe1fc2d99fd87b70f94580170c476
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a recommendation letter, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/strik?utm_term=sample+recommendation+letter+for+a+teacher+colleague In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_601d91513368d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_605b7574c646d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_60108e8c47155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_60639641bef16.pdfIn PDF document text
    • https://potegixizaw.weebly.com/uploads/1/3/4/5/134588155/bdfd4268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5ffd71a0ed1d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_602daacb382d3.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/1725497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_600f544a558b8.pdfIn PDF document text
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/4009202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_6041d4cb7e6e2.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/24d508443288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_605600241d01b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5ff207c486754.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/d02e0ea5-b1a5-482e-b26c-32e762499aa7/programmable_logic_controllers_an_emphasis_on_design_and_application_kelvin_t._erickson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a65877-16d9-4406-a7d9-9cd6c19fc876/planificacin_estratgica_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738916bd-5b55-44f6-9586-bc83961ced9f/mortal_instruments_movie_song_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcdeb949-378f-429f-a321-b860253ae902/3019670953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddb53d6-9a6a-435f-8583-30e9d8c4536d/timed_fluency_passages_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33af33cf-e4cb-431e-8a09-07316a821aa1/mesavogegubagad.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_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 5496 bytes
SHA-256: 2108011595a8e2f5952c0fee1bbe84ec64e7f7f041d6732c09ca1952260a4f3a
font_01_sfnt_off00012f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 10788 bytes
SHA-256: 327ef6ce77d121ba6736872bb891613b03bb5d0f791fc51a2b97464f99fa846f

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