Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef4f669b7beb6c2…

MALICIOUS

PDF

80.7 KB Created: 2021-03-26 08:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326b685be2d98aa35ea8b2b969c2c7af SHA-1: 5350dcc419612fcbda6a7f82c1dc0fdb277b6c31 SHA-256: fef4f669b7beb6c2b8c543947ccefdce65c45446ddd7c53fb2d1cb5d2709cceb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute malware or phish users. The embedded URLs and the heuristic firings strongly suggest this document is part of a campaign to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=systems+of+equations+with+fractions+worksheet
    • https://nitegira.weebly.com/uploads/1/3/1/0/131071289/pipejaxujolen.pdf
    • http://nextauto02.ru/67996773042rl116.pdf
    • https://jafiwivejo.weebly.com/uploads/1/3/5/3/135305612/kabiborisosasuzan.pdf
    • https://cdn-cms.f-static.net/uploads/4451754/normal_603817e06096d.pdf
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/875225be400f.pdf
    • https://xisovunegukizak.weebly.com/uploads/1/3/4/8/134868464/turomigotipotam.pdf
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/5812053.pdf
    • https://narivuwejuw.weebly.com/uploads/1/3/5/3/135310919/6337599.pdf
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/mirore.pdf
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/1813423.pdf
    • http://larediwavokib.iblogger.org/katazodukaso.pdf
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fc662d6de084.pdf
    • https://fuwiwidiwijidex.weebly.com/uploads/1/3/1/6/131637339/gofigovagapudirika.pdf
    • https://cdn-cms.f-static.net/uploads/4498330/normal_6041602521b6d.pdf
    • https://cdn-cms.f-static.net/uploads/4379498/normal_60432451e9828.pdf
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/3444357.pdf
    • http://contact-git.top/735203235509x620.pdf
    • https://ruliduwaj.weebly.com/uploads/1/3/4/0/134016670/tumolulipaworexo.pdf
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/9359044.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/joxelot.pdf
    • https://nuvuxupu.weebly.com/uploads/1/3/4/5/134507381/tukupaverebeke-jirezupajudafip-birikonebodix-jajuwipel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wokezafuvix.epizy.com/22720328147.pdf
    • http://soroxafuvi.epizy.com/stern_louis_canales_de_comercializacin.pdf
    • http://mulisemovilunud.epizy.com/children_s_nursery_rhymes_audio_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6b.bin
1da1b035758bffd51b8f918694382ae34d41622e104b5b2884ac6b2108a5bf1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5460 bytes
font_01_sfnt_off0000fede.bin
ddacfdd8b37c2486530c8f7f49f84fb65df7971525f27dc1bc7ede464dc63f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 11216 bytes
font_02_sfnt_off000124c3.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 4324 bytes

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