Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b365eb8b2a3c1f3…

MALICIOUS

PDF

68.6 KB Created: 2021-05-29 03:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a2a5bb6402f79d3ab67b155907bc9e9 SHA-1: 0d4414efffd2cd715eea7ab27148e121aa384e55 SHA-256: 1b365eb8b2a3c1f3c76a61d205666b76f6a4f83051c1aba2f9fbafba3401ddaa
156 Risk Score

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 operation. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links generated for SEO purposes, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/wb?keyword=perry
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/5905467.pdf
    • https://votaxejasusax.weebly.com/uploads/1/3/0/9/130969278/682898.pdf
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/vubekagudevok_xozuxizo_xurevu.pdf
    • https://lexifomaxinu.weebly.com/uploads/1/3/4/5/134595187/6948824.pdf
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/1674621.pdf
    • https://zowinalonewexaf.weebly.com/uploads/1/3/4/6/134680062/2015522.pdf
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/kedanurisixe.pdf
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/6656660.pdf
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/garezenesuwope.pdf
    • https://wimukesogizat.weebly.com/uploads/1/3/4/6/134639197/puwugoponele.pdf
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/nelowe.pdf
    • https://sixojidolox.weebly.com/uploads/1/3/0/8/130814042/wadadolisubuma.pdf
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/pizogemupe.pdf
    • https://bosevexoliwi.weebly.com/uploads/1/3/4/5/134585498/e5298ba.pdf
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/9934083.pdf
    • https://fadegoke.weebly.com/uploads/1/3/5/9/135990174/dogukag.pdf
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/muvutejepinomazogewi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/809a68ce-7d59-448f-8979-1d70ea2e1d71/fat_loss_gym_routine_beginners.pdf
    • https://uploads.strikinglycdn.com/files/66ed0399-a0fb-437f-97db-5daadd77d1a4/how_to_write_javascript_code_in_jsp.pdf
    • https://uploads.strikinglycdn.com/files/ec6908f4-543a-4666-936e-4322ef2cbd98/what_size_tires_for_2002_jeep_grand_cherokee.pdf
    • https://uploads.strikinglycdn.com/files/599ee0e9-55ea-4118-a762-6ab45fe9247f/safibamefajovefifeb.pdf
    • https://uploads.strikinglycdn.com/files/e7d52002-b221-4d30-bae5-6431dd3899e3/60745554453.pdf
    • https://uploads.strikinglycdn.com/files/cf3215ce-2a0b-4151-a4f1-bf6133227a60/juzuku.pdf
    • https://uploads.strikinglycdn.com/files/37bdf43b-9830-44a9-825c-d8d55794e412/what_are_the_major_impacts_of_climate_change_on_environment.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_off0000ccd3.bin
28150878bc38528c094541a2862a72133a3be673f2d5df2bfc19f9a84c6aa105		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 5908 bytes
font_01_sfnt_off0000e0cd.bin
7ae486e218e37790b56f98bfaa70b4ae102ace3932e78aeccca058e10f3d8d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 10424 bytes

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