Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d74a924c012f64…

MALICIOUS

PDF

85.5 KB Created: 2021-06-11 12:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 658699f1410ad490950f313f4966f61c SHA-1: aee1589b86d1fd4f7bd46e73fc5354161640147e SHA-256: c5d74a924c012f64467de95dd163023b9d6a0486701a96d60b9287c0af4df878
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/pbw?utm_term=death+book+by+sadhguru+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376125/normal_60677d4fc94ad.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/1063869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_60139fdbbfcf4.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/5391716.pdfIn PDF document text
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/lorigumoriwidanagafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_6023fe6bd972f.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/desosunenevo_kadifavoxira.pdfIn PDF document text
    • https://woralolur.weebly.com/uploads/1/3/4/3/134359953/7279072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_606b6f571f6b4.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/209e9581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_60b8716c558ab.pdfIn PDF document text
    • https://garepogive.weebly.com/uploads/1/3/4/8/134871831/zufalujux.pdfIn PDF document text
    • https://zoxobafibo.weebly.com/uploads/1/3/4/2/134235835/xilal.pdfIn PDF document text
    • https://jaregufadux.weebly.com/uploads/1/3/4/0/134016720/9372007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziduzobif.pbworks.com/f/24000978724.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/47078369440.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144712122/gujojosujivodezumovin.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144478653/nufodetesozabaripuduxepa.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/biwidugujegazis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6889826-95e1-4dfa-adaf-e56184ac3e4e/adobe_acrobat_dc_serial_number_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bb983e-522d-4707-90bd-dabd574ab1f3/95445110018.pdfIn PDF document text
    • http://negekovav.pbworks.com/w/file/fetch/145046460/11664423622.pdfIn PDF document text
    • http://gitizuxob.pbworks.com/f/download_wps.pdfIn PDF document text
    • http://wotesova.pbworks.com/w/file/fetch/144759153/galosuzarenepupowo.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
    • 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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 5700 bytes
SHA-256: cd4bae9ca6c42b1a02479c641b9c8a1214deb08c7b7729b92a30a08f8a6be016
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 11468 bytes
SHA-256: 5777e0d32994ad407f93c229e0ec870bc35f3eccd5e1cb5879fea3008980ffa5
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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