Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f6b6670eba2e41…

MALICIOUS

PDF

70.0 KB Created: 2020-11-24 21:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: efb38d03a6cbd1a5fa0a372e2be2e3cf SHA-1: bab8ed3dea534b85cb0185fac4f35db52e381eeb SHA-256: c5f6b6670eba2e415115f5fed17d39b4d877b010ecad23818367908320dc4e53
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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
  • 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.
  • 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://traffking.ru/strik?utm_term=diferencia+entre+principios+y+valores+eticos PDF link annotation
    • https://sorumawuv.weebly.com/uploads/1/3/4/5/134512036/pedikogu_rolobuwofak_kugutupapa_zitexen.pdfIn PDF document text
    • https://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/ce123d9.pdfIn PDF document text
    • https://vijipivefewari.weebly.com/uploads/1/3/4/6/134624644/19981aca05f.pdfIn PDF document text
    • https://kusugano.weebly.com/uploads/1/3/4/7/134740680/fevisafepele_xogove_pifirowade_gemira.pdfIn PDF document text
    • https://vadibuxazuxubaw.weebly.com/uploads/1/3/4/8/134855910/2860517.pdfIn PDF document text
    • https://jawanowek.weebly.com/uploads/1/3/4/3/134356941/sorinagejaf_xebogazi_jepomos_bivofes.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/xeponodij/better_factories_cambodia_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876ec465-6b69-434a-a7d2-f5f964057c91/59814486937.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/likikimemadedugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74db11a-6417-4a6a-985f-f04c5d2415bf/nevovisebimowowev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df22d143-14c2-4735-8001-bcec47b2fe1b/kamedajikisasidigadarevek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d579c846-4341-45cc-998c-0cfb9908d304/96016669934.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/gundam_breaker_2_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/dupidebamezi.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/facebook_live_apps_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5171598-0219-4199-8a7c-ba8d460f218e/gulipafemekurawonibekafaf.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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 5168 bytes
SHA-256: c626fe6c71d7148b962b97197513f59e424f0366686d54e6fef152aed7c75a01
font_01_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 10640 bytes
SHA-256: 1f6cc1a0fb3163b42f1daea53be750d9b88a40d84972808d48d98fb06611ec82

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