Malicious PDF — malware analysis report

Static analysis result for SHA-256 427cf5d23dd670ec…

MALICIOUS

PDF

85.1 KB Created: 2021-04-03 05:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa353cd242d92073cd35c941a8b6fd4f SHA-1: 27f9a61ac06b2a67ddec18af923d6ba9fdcdaee5 SHA-256: 427cf5d23dd670ec7eec843f51c43d1028397e8a1fe22e38075b42df19342a07
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or unknown hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to academic materials, designed to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=solomons+organic+chemistry+12th+solutions PDF link annotation
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/4676568.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/467207918998tnn8.pdfIn PDF document text
    • http://tomorubi.22web.org/sedujurafuwiv.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/2488849.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/1004882.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/53260940545.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/xanamavoduxu-torate.pdfIn PDF document text
    • http://nesejanemik.22web.org/adobe_indesign_cs6_classroom_in_a_book_free_download.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/tonuvimexovuxurabovo.pdfIn PDF document text
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/dugef.pdfIn PDF document text
    • http://chempion.coffee/proses_pembuatan_sepatu_kulit7r5lc.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/8005963.pdfIn PDF document text
    • http://kwini-fini.online/super_deepthroat_downloadj1rwj.pdfIn PDF document text
    • http://xidufekaposepun.iblogger.org/31556824165.pdfIn PDF document text
    • http://spainwow.pro/detox_foot_pads_consumer_reportsgcopf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/831bc822-bbf8-4a9a-8ffb-8aad877d1520/what_are_defined_terms_in_a_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e381a9-aa89-4bcb-aba9-c9c072ff7be0/vomosenujafunabut.pdfIn PDF document text
    • http://desakoda.rf.gd/84331861844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b41602-cdc3-4826-9d09-0b547414104b/charlie_and_the_chocolate_factory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e050f581-5d72-4b6b-bad2-22725fb44df9/genie_powerlift_900_remote_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb32eaa-f174-4527-8165-e319c7585901/is_the_2005_cadillac_cts_v_supercharged.pdfIn PDF document text
    • http://kulegekagaxi.epizy.com/26721296529.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 5600 bytes
SHA-256: d21cbebc47b4b19fcd3b77a25b13007fc3e5caf83fb50b9b3a715083a72882ee
font_01_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 12292 bytes
SHA-256: ed09937fdc75d8fdc9bd05ac4411aa354f8d9b3e4caedd8a9b45d2a369feb58d

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