Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44569f5a0176b7f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 05:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d3ab09f0af9c6558707dd06af57abd1e SHA-1: 656ab42253c64fbf2f95755a7c733c6dc8b17ed1 SHA-256: c44569f5a0176b7f7291eba92ece855eac1e2ac99a252dcc2d79e316279b7bc2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document, likely a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=dossier+aide+juridictionnelle+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/tawavumazo/ahcgjit/dikufopasafafu.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/3898884.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/wasotid-lerapugima-wimopepabudazeb.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/ponazemotoxuzizusi.pdfIn PDF document text
    • https://jebigifapiw.weebly.com/uploads/1/3/1/3/131379276/80b90d60f6f6976.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/kjSighh/63682549934.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/fuwixilusu.pdfIn PDF document text
    • https://bovebonidufos.weebly.com/uploads/1/3/1/4/131483372/924a6.pdfIn PDF document text
    • https://viforiler.weebly.com/uploads/1/3/0/8/130874197/betepomoterenab-nupixu-wajodufofiwalaw.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/Lgegdez/ghana_education_service_integrated_science_syllabus_for_jhs.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/jhxbhaa/770172769.pdfIn PDF document text
    • https://guwosifewutus.weebly.com/uploads/1/3/4/6/134616196/3c60baaafdc.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/lezopobigeza/fagijurapumirabumufima.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_dcfab759022e4797a81ad92436d5f0bf.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_39d8cf49bf154a34af59254987192abc.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_76ee3180c3d6421499b5831d914f7171.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satuja/kcet_2018_answer_key_biology_version_b.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/occipital_neuralgia_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/itunes_terbaru_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/30230598752.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_ab5e9482b7d7413f8b2f482a66bb3e05.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_874375266f9b46b8a89c2e2186d1e441.pdf?index=trueIn 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_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 5496 bytes
SHA-256: 65623023cd9c9147245615aeb9ecdf57147c1189c72f029375a86315a5ce0e11
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 12588 bytes
SHA-256: 364a2f64ced721be6e8309460d4955aace63af28660b64572c1a9dca8c12eb04