Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c394b8d7e0e7b99…

MALICIOUS

PDF

64.4 KB Created: 2021-05-20 02:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f74f3f9d6d399224ca68c5b168cdcc4 SHA-1: d3f33e5bc996e04517ef51bd62f354b2427ae223 SHA-256: 8c394b8d7e0e7b994f3a8f7fdf28a42fb60dee53e1540f7cbf3575dec37be31b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a domain associated with malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=free+printable+family+tree+template+4+generations
    • https://cdn-cms.f-static.net/uploads/4443803/normal_604f5f7eeb476.pdf
    • https://static.s123-cdn-static.com/uploads/4392661/normal_5ff8bc201eb1b.pdf
    • https://rabusefikitane.weebly.com/uploads/1/3/5/3/135314736/tizer.pdf
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/4363959.pdf
    • https://cdn-cms.f-static.net/uploads/4445882/normal_60360b7c25e56.pdf
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/zeneziretus.pdf
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5fe1ef92a6c87.pdf
    • https://cdn-cms.f-static.net/uploads/4392210/normal_601b1ea43de40.pdf
    • https://xudezilo.weebly.com/uploads/1/3/0/7/130739240/08bcf2.pdf
    • https://static.s123-cdn-static.com/uploads/4417408/normal_5fe04aa552068.pdf
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/nubunekep_juvaze_vaxuw.pdf
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/e84bfc19fe3.pdf
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5ffb5e584f60c.pdf
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5fe19c1773156.pdf
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/kezer.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/xomafurafudinufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kibavutibeved/ccleaner_windows_10_64_bit.pdf
    • https://s3.amazonaws.com/gumagabu/what_are_the_5_key_environmental_indicators.pdf
    • 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_off0000c1b8.bin
da38dcdbfdae2faed8ecdb6a2b3fa9ba2ffdcfacf50809b598d10c4712ff24b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B8 5504 bytes
font_01_sfnt_off0000d474.bin
6a94491e32292d0f12567d98ec0ed377b95c435a680ccc8910a132527b173ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 9312 bytes

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