Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c3f6912b58c402…

MALICIOUS

PDF

77.0 KB Created: 2021-03-03 23:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e41bcc503001c7fe340e2bdfcc3db36e SHA-1: dc2ec972584aaa907a0260789996bf4d6362960c SHA-256: 70c3f6912b58c402dffa9aa8b71817323a4b8b972f85e5eb3971b2991494e303
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The presence of numerous external links, particularly to `kuzutuzo.ru`, suggests an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to drive traffic to external resources.

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://kuzutuzo.ru/strik?utm_term=card+college+light+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5fc5af10798ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fe9fd4373e68.pdfIn PDF document text
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/mizegasoluvijunik.pdfIn PDF document text
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/zitokegov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5ff5fd966d223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_60172858ef5c3.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/d7197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_60206fcaac5c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_603e41d65adf9.pdfIn PDF document text
    • https://zameleto.weebly.com/uploads/1/3/4/0/134042643/4878836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fe81a1d1ab5c.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/wuzalugiseto/97683032511.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/49074530651.pdfIn PDF document text
    • http://xubudexev.epizy.com/49888192709.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/update_android_4._4_2_box.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/85473615365.pdfIn PDF document text
    • http://jopewivazolu.epizy.com/reel_music_exploring_100_years_of_film_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/beej_s_guide_to_network_programming_amazon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 5144 bytes
SHA-256: ee2d449b79c6a18091fc0691dda82597ea85632383673e7f48be759bb0715bd5
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 10668 bytes
SHA-256: 6da10a7ce7e37b2bae77b026e171f9960c7fb90bfce397780b795b4d72c6352f

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