Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bf8314eed461f1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 18:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e5fd1d0ddea2408dd632c15b60cc3c9d SHA-1: 191c064b2d364352c4603e3072e934e3b4993186 SHA-256: f6bf8314eed461f150db71e0fd01894b7e167408ad4533969f10775ee1f301ea
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though partially corrupted, contains text related to a PDF download, aligning with the 'Urgency / deadline lure' heuristic and the overall phishing/malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=anandamela+pujabarshiki+1426+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601edd1320c00.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/fd62c54ec7a02b9.pdfIn PDF document text
    • http://tanitebose.22web.org/what_causes_hot_spots_on_skin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fce7b5e07e31.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/6345067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5ffd46c5124d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_60010235e1f62.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/devuxuzejozam/bcci_ka_full_form_bataye.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_5a3dfd4a47b345e991cf36256388cea4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/bitdefender_total_security_2018_datasheet.pdfIn PDF document text
    • http://fapegilijaz.rf.gd/themes_in_wuthering_heights.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_d8329b322654478fa9229d1ffb1e0344.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/kadol.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/vopewogawimufalozegi.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/8696213309.pdfIn PDF document text
    • http://jategemi.epizy.com/dipowefidisatexof.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/infographics_template_maker.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/kazebenudinumuzuguvox.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 5976 bytes
SHA-256: 4af20f1284edb7398cd02df917d974c8ef286cee2aa1bef2424af4dc6070011c
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 9484 bytes
SHA-256: dad2d790039f6662d2f955e89e876c983947c3371f8aaf2958a52c978b0432fb
font_02_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 11396 bytes
SHA-256: bb0890787d09d67cc1b6e014ac47858b314af2829be49afea17bfe3d94f462a0

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