Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f35eb71deeea74…

MALICIOUS

PDF

77.0 KB Created: 2021-03-21 07:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 028ce8bad79315ade320c491ea8605d5 SHA-1: dff3df5409b20d2d6577f4ab6e56119e6da0c549 SHA-256: 38f35eb71deeea743d3016417a473b2ae79f1e000bbd56dfecec605984d4df64
194 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 designed to distribute malicious content. 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 link farm behavior are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zakuxaposud.weebly.com/uploads/1/3/1/3/131382531/3208172.pdf In PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/6186489.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/22678291560.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/equilbrio_cido_bsico_fisiologia.pdfIn PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/wevokavibimuminudi.pdfIn PDF document text
    • https://tenusalawumuta.weebly.com/uploads/1/3/4/3/134332014/360686.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/jozetuzubafu_xozegawototataz_misurok_zunikuzixufi.pdfIn PDF document text
    • https://fakodide.weebly.com/uploads/1/3/0/8/130874451/koxukeroberutekubaf.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/3801906298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_604fef948063b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_604d9e53856e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5feb709124467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_600ec26711bb6.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/lirede.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/california_consumer_privacy_act_2020.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/0caf59d21a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=epson%20artisan%20835%20setup%20wirelessPDF link annotation
    • http://nukilaba.myartsonline.com/rilobawiwebifezokugupo.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/bolens_lawn_tractor_with_tiller.pdfIn PDF document text
    • http://jalebuvubo.myartsonline.com/mozuxareba.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/50352311659.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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 5344 bytes
SHA-256: 8e06be1fc871b0929163802298ca61e90e4c9516796f3b3cf2d8b706ce5bad8f
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11416 bytes
SHA-256: 6df9e9f3108e8750a7ede3129911cbbab08b825caafb4c9d1c4ac47eaac6a679