Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3161326dbeadf7a…

MALICIOUS

PDF

82.7 KB Created: 2021-03-19 04:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d0782d4778b99ade005e6dad07b14e SHA-1: 7a1fcf1f363f45d4e3b83e5f0b26382509fd390e SHA-256: c3161326dbeadf7a7931e28796a3fb0b2bd5fe6977c3ddd609d1de7df62d462c
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 of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/wix?keyword=farnsworth+elementary+school+rigby+idaho
    • https://cdn.sqhk.co/dewufidabo/iii1Jii/23807252266.pdf
    • http://gejokakop.mygamesonline.org/zixajunatopekawaf.pdf
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/zunuje.pdf
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/tixutobobabeg.pdf
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/siwegogodi-rixegon-wunupuzok-zopuw.pdf
    • http://kimidenexikox.getenjoyment.net/punuxaguwoluxalidufiguwo.pdf
    • https://cdn.sqhk.co/vobilurerire/gQJt4bM/weretiger_template_d_d_3._5.pdf
    • https://cdn.sqhk.co/fakineduxafe/lhajgq5/dental_clinic_management_system_template.pdf
    • https://ruvararet.weebly.com/uploads/1/3/1/3/131398095/binufogapavi.pdf
    • https://cdn.sqhk.co/vegedusovo/Qhe0nii/tractor_pull_fails_2015.pdf
    • http://pakizimavom.scienceontheweb.net/7992492271.pdf
    • https://cdn.sqhk.co/lofopapenow/zjeb3gi/fetodolobutajuxaxego.pdf
    • https://cdn.sqhk.co/bogijifaviba/hjijgWf/61592325843.pdf
    • https://cdn.sqhk.co/bowazeduz/Q4tlyhd/giletubulejivakemigat.pdf
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/4168295.pdf
    • http://lejidakoxinetog.mywebcommunity.org/53291759970.pdf
    • https://cdn.sqhk.co/lenubire/helCjcL/zixudize.pdf
    • https://cdn.sqhk.co/pelopuxi/hjrYjgl/zozes.pdf
    • http://fodekofuxuvum.sportsontheweb.net/45596262157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jewizopukuni/makikugoso.pdf
    • https://s3.amazonaws.com/xotomisen/22518064947.pdf
    • https://s3.amazonaws.com/bipepezuwed/wolf_oven_self_clean_cycle.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e036.bin
fbb7058e64eb608e6e2a592d3d0d93f834956c492aa7d2a96fbf6d2c65d9bfec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 5432 bytes
font_01_sfnt_off0000f295.bin
c66fe030db8d5f7720324315a161f5f486dd1f814d27a6cb28b71f9257f40af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 11392 bytes
font_02_sfnt_off00011993.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 16204 bytes
font_03_sfnt_off00012ec1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 4324 bytes

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