Malicious PDF — malware analysis report

Static analysis result for SHA-256 6074dd06ed2d5574…

MALICIOUS

PDF

79.9 KB Created: 2021-04-03 06:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bbaa637da409dc2d955c6d1b8aa47ef SHA-1: dd39b0358992299b601671c5858fd638bea8f91b SHA-256: 6074dd06ed2d55749ee85547f2e853e4e9865c6eea24cebd507d6986ff704de2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'reading comprehension exercises'.

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-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://vilenefex.ru/strik?utm_term=reading+comprehension+exercises+with+answers+ppt
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/nilas-novunegafogi-lojil.pdf
    • https://cdn.sqhk.co/xajamenujo/egekgev/what_does_reversing_roe_v_wade_mean.pdf
    • https://cdn.sqhk.co/suxepemup/jgcAKqQ/btd6_free_download_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4463824/normal_60232bbd3c023.pdf
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/roziwoxobero.pdf
    • https://sojenakituvewo.weebly.com/uploads/1/3/3/9/133986345/wosiz.pdf
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/758514.pdf
    • https://boxepupobitu.weebly.com/uploads/1/3/4/5/134587113/8857760.pdf
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5fc912d44efdd.pdf
    • https://cdn.sqhk.co/loganidob/hh1ibhc/27353311386.pdf
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/8754803.pdf
    • https://cdn.sqhk.co/fudamewojaf/2jfibhd/ruwirajixuzodinusuki.pdf
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/78792f1f3ce39.pdf
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/0aa9894476dade8.pdf
    • https://cdn-cms.f-static.net/uploads/4416930/normal_605cf09c27447.pdf
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/8e0bf32.pdf
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/filiduwewivaxubila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://romudob.rf.gd/ligudutifof.pdf
    • https://s3.amazonaws.com/fusidejebi/tisajas.pdf
    • https://s3.amazonaws.com/kibavutibeved/how_to_learn_egyptian_hieroglyphs.pdf
    • http://rusuxagek.rf.gd/customs_union_theory.pdf
    • http://pezokom.epizy.com/22984287096.pdf
    • https://s3.amazonaws.com/wumodukubaru/fadupox.pdf
    • https://s3.amazonaws.com/wujafivabipo/addition_worksheets_for_grade_3_with_regrouping.pdf
    • https://s3.amazonaws.com/forupokisip/62614020393.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_off0000f8bc.bin
2431714317c6354834e0b62285de3aa4ca2fef313f2b3461b1793dfedc7a514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 5620 bytes
font_01_sfnt_off00010bd6.bin
adca9ad9340bbcc4d3aa4bd38ee47cd31b83d3ab9981ebc26bd8b81ca3a64c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 11012 bytes

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