Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa9f6df67545a68…

MALICIOUS

PDF

79.5 KB Created: 2021-04-27 23:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 593a38d9f7833ff9983bcb0e1f2db933 SHA-1: d220ecd15862db0c615332d1b5285592d70440e9 SHA-256: 6aa9f6df67545a683b36b7a6c0e6c0702f57a8da69eb48d4fd8b21f7ec6140e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external URLs points to a malicious intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=can+i+sleep+wearing+contact+lenses
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ffbdee26b6a0.pdf
    • https://cdn-cms.f-static.net/uploads/4413587/normal_601e2b9b5ca8e.pdf
    • http://pop-marketplace.ru/zesenedie2nf4.pdf
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/066b384ad15cc.pdf
    • http://fasadi.site/profusion_1500_watt_ceramic_heatermja7d.pdf
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/jenuvexujoleg.pdf
    • https://cdn-cms.f-static.net/uploads/4530712/normal_601bff0304186.pdf
    • https://cdn-cms.f-static.net/uploads/4365646/normal_603230601fea7.pdf
    • https://cdn-cms.f-static.net/uploads/4369179/normal_601306ac62f64.pdf
    • https://cdn-cms.f-static.net/uploads/4380699/normal_60444b3d2a9c9.pdf
    • http://ritegifufefut.scienceontheweb.net/java_programming_language_for_beginners.pdf
    • http://todayshop.website/98680717998vcoua.pdf
    • http://tibetterrier.ru/33389687470x4hin.pdf
    • http://vonexalux.sportsontheweb.net/reading_aloud_and_silent_reading.pdf
    • http://jexekiraj.sportsontheweb.net/50535514263.pdf
    • http://7lessons.space/hp_probook_6550b_maintenance_and_service_manual7ye5q.pdf
    • https://cdn-cms.f-static.net/uploads/4411493/normal_60224c5422c9f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_6381c3b263694e0b8407d7b86841bd11.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_157dc4f3785744d09d53ef1fcb1944c6.pdf?index=true
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_fffaaa938d7840fdb5b95bb218853b89.pdf?index=true
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_428ff8dcefb0464a87e0d14f4c5bc9a5.pdf?index=true
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_e7bd912d99714f3a8dc863db90aa943f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fe.bin
051471ee7874174f1dc4ee8adc6a90ac4e810fde9330f6800e9b1026544583a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 5096 bytes
font_01_sfnt_off00010a77.bin
8909f4a3cd95991393b28afc623b0ee0d762002f54fec52ac19e0574454ef7d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 10744 bytes

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