Malicious PDF — malware analysis report

Static analysis result for SHA-256 4570a9160f3dba9b…

MALICIOUS

PDF

83.0 KB Created: 2021-05-07 20:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 02098020749f6deeb04cddb055ec9330 SHA-1: caf1198ee1d75851232a7b762b46e0e67ae11a28 SHA-256: 4570a9160f3dba9bc3e08c6dc987584f43a5799b75770bc2d01d518467de2f7e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=hp+8600+printhead+clean PDF link annotation
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/simutul_ledixixufazu_peregupujawivo.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/5331936.pdfIn PDF document text
    • https://cdn.sqhk.co/bawivurolut/hbh7hjQ/voxoxufam.pdfIn PDF document text
    • https://cdn.sqhk.co/rifasidajika/GAAhan0/xexexalepuxoworelokanen.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/456385.pdfIn PDF document text
    • http://gododerur.66ghz.com/adobe_online_registration.pdfIn PDF document text
    • http://wivejudotimog.22web.org/25827698014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5ff5b521b3d9d.pdfIn PDF document text
    • http://pexovowa.iblogger.org/67984679228.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/jfM0eif/rubirunetudoluje.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/django_show_many_to_many_in_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_6034f79439c0c.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/Tolhbgh/the_sims_mobile_cheats_iphone_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_602c3638ab9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_6023d7e2a7eda.pdfIn PDF document text
    • https://nanoxoxudotu.weebly.com/uploads/1/3/0/8/130814682/vidipibun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_606e6737b1fdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texatopewewew.epizy.com/bowlby_theory_of_attachment.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_e34c236cfbdb4c219aa322a1d8814454.pdf?index=trueIn PDF document text
    • http://betudurinipop.epizy.com/20765632207.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_bd25c191b7444d56ae320251cdc29d77.pdf?index=trueIn PDF document text
    • http://keviful.epizy.com/fed_beige_book.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_bf564ea3c8c4433e81774ead06ae3cb3.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_f9caf7055774430a92d0b54dd6fc1955.pdf?index=trueIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_b5859cd180e24b109d2645a08ad506f2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 5436 bytes
SHA-256: 0ca33d4283fb38539855ec1ac8858d526c40bd55cf0702e54288283930bd4853
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 12744 bytes
SHA-256: 69bbe8af129bff3dd93b47a244a85acf49d39cae9cecde1e1761c5f1d3fb7fe4
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16352 bytes
SHA-256: 8f862d6127945e00b4ab1413be3e26e776acced32d18e3b763d6e8e175a258a9

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