Malicious PDF — malware analysis report

Static analysis result for SHA-256 c527f52d6ee60aaf…

MALICIOUS

PDF

82.4 KB Created: 2021-03-28 05:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f501ad35bb35f9140ad5f90ca95dcfc SHA-1: 7d1f18c40659044b4c96611401f0585de28a33de SHA-256: c527f52d6ee60aaf50872a61e5f26766d1b83c346e862c421de6605214636644
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate this is a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=geometrical+isomerism+in+coordination+compounds+pdf
    • http://purigoguwoz.22web.org/bahut_aayi_gayi_yaadein_song.pdf
    • http://jaligovaw.iblogger.org/film_production_agreement_contract_template.pdf
    • http://kivabetirane.22web.org/memento_mori_libro.pdf
    • https://bizawipogimiwa.weebly.com/uploads/1/3/4/3/134316434/9286022.pdf
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/tebizaso-lumimufamizige.pdf
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/depida-monufisizakeru.pdf
    • http://nimiridisavir.22web.org/popefipuratezuxewemave.pdf
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/lezarirer-tuvoriru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_e2c5beb6bef040b4ba9065fe5db2b6ac.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_d49c64d076ba4441845eeff3eabcbb9a.pdf?index=true
    • http://dipibezepipes.rf.gd/19444681578.pdf
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_b51b69f313c943f2bffbeb820aba71d2.pdf?index=true
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_48514e38b0ec4c25b889360ae8026933.pdf?index=true
    • http://fopajika.epizy.com/emergency_medicine_med_residency_reddit.pdf
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_3a68822618ea4739a01018684220d9af.pdf?index=true
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_74cf101c434146c3acba883063281e10.pdf?index=true
    • http://kuxogazixup.rf.gd/xejejegota.pdf
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_a8f70f56476841949af8e9ad511e3f29.pdf?index=true
    • http://kezadovimitaw.rf.gd/comma_examples.pdf
    • http://kibulirol.rf.gd/77237413538.pdf
    • http://xajalad.epizy.com/pdf_auto_portrait_landscape.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_off00010278.bin
812c6d6973a5b475c143bd9d97e28c3afda6e4274e8b63636c25354b35a0ca04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 5332 bytes
font_01_sfnt_off00011482.bin
41e7e722ce3eebed3cc0d089258c4c142cc3685aeeeb0ff2503e496a9fdbd220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 11756 bytes

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