Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8e4b7df325d3a5…

MALICIOUS

PDF

73.5 KB Created: 2021-03-10 15:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b63271d5787f2eff76e878bfc99c1d4c SHA-1: 2cb67b67dee49fc1b013abb26965155cc0d02685 SHA-256: 4e8e4b7df325d3a5c1758be839b2cd341f1a4d06bf3c469145a750925ce0144a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/strik?utm_term=how+much+a+mental+health+counselor+make PDF link annotation
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/gofegemesojaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418381/normal_5ffe66d12f78e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411480/normal_6004b33be0ea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fca3db3e7ecb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5fdd8965d15c1.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/fenekezovajef-terofufafu-futotomex.pdfIn PDF document text
    • http://tukazijib.22web.org/blood_stone_english_movie.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/tubivutejeso_kixiwedapewut_gogapotoxife.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/muwugujizuvoj.pdfIn PDF document text
    • http://vixidijogaritix.22web.org/integers_class_7_cbse_worksheet.pdfIn PDF document text
    • http://pexukakadom.22web.org/1890119648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_6044cc1c7801a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_d18a272e0220471fb770d11b16f531e3.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_ebcaa864e0cf4a34b0b5655706982f3f.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_cc23d7d59b4d4648b99f4cb20986d4cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/one_free_carfax_report_coupon.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_6cd759a4bb414e27a90bdaa0f62b139f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanubili/70405455650.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_38376796c59947849feff1a8bbda1859.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_c18f38d5273b47faa89a97c3727cce2c.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_f17c5c16a27d4fdd90a0273d414c76dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/bakibitepusavujofemez.pdfIn PDF document text
    • http://zikukoji.epizy.com/27702319448.pdfIn PDF document text
    • http://kelegelevun.epizy.com/whats_happening_in_disney_in_2021.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_bf426a86a91f469b96f7f499a931ed10.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_1db6565b5f7e4dc8afc6f07763fca2c1.pdf?index=trueIn 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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 5156 bytes
SHA-256: 30db3c9c530ddfeb6e2018d84962354f99f08a48907f75bb1cf549e0bf5c35cf
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 10860 bytes
SHA-256: 62b56c5b8595ae4dca3743ee06507b08ef0cfbfbdedabc9c4b700895b277b708