Malicious PDF — malware analysis report

Static analysis result for SHA-256 411d63062e3514cb…

MALICIOUS

PDF

73.2 KB Created: 2021-06-07 13:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 43624b95f4e2f81ed2e5b3622841b953 SHA-1: 3e8a135568b4487626117002d3108a2dfb29f71b SHA-256: 411d63062e3514cba88fe5eeeb9c1e34c219f26ef959a3c7ab9b9c007c37c032
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=tiktok+presentation+example+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490736/normal_6041675be03bb.pdfIn PDF document text
    • https://wezogefizu.weebly.com/uploads/1/3/4/2/134234847/lotogoredo.pdfIn PDF document text
    • https://kiwepuzimogavuf.weebly.com/uploads/1/3/0/7/130776877/1875841.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/61539e703b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_603023ab58ae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ff40239ca64e.pdfIn PDF document text
    • https://vodoxuzet.weebly.com/uploads/1/3/2/6/132681632/7d5c5.pdfIn PDF document text
    • https://wiwoxedanin.weebly.com/uploads/1/3/4/0/134012493/6787808f98693.pdfIn PDF document text
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/9651649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5fe3182a74e1c.pdfIn PDF document text
    • https://tovukofovimo.weebly.com/uploads/1/3/4/4/134485408/pavatiromujapona.pdfIn PDF document text
    • https://kaxapajitab.weebly.com/uploads/1/3/4/8/134896246/dapafolak.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/e8879868d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4444856/normal_60b7920ee8b13.pdfIn PDF document text
    • https://lukajupuxeburi.weebly.com/uploads/1/3/4/6/134630189/349fef0549.pdfIn PDF document text
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/vonox.pdfIn PDF document text
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/gegogomafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/vujafunokibore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70f7d28-f033-42d3-b7ee-ea514483bae7/sierra_reloading_data_30-06.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168f819f-e564-4e75-9303-ca792d3d5529/galosipedo.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/need_for_speed_undercover_cars_download.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/easy_english_speaking_course_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc04764-4371-4f19-b427-20edeb06e5b0/9009249973.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144421374/9768212217.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_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 5268 bytes
SHA-256: bec655a82b2df0d1562ca594aa9062cf5c640f289e016a508a9d4b11a8b10ba4
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 10460 bytes
SHA-256: 3afeef3c49bba2c4c23d95371c156f6be6beb848e91bab967a4859232f78215d