Malicious PDF — malware analysis report

Static analysis result for SHA-256 67853a75b8ea099b…

MALICIOUS

PDF

89.7 KB Created: 2021-03-30 09:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fcf91f81c70b059a0b91f19e2d053067 SHA-1: 4ce0741df2d9e80c8baeb7e76315d53cab64a3e6 SHA-256: 67853a75b8ea099b2e1df11bc8cfff3df52650762ee496dd340dd7acbd9da414
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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 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.
  • 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://dugedepap.ru/strik?utm_term=navy+diver+salary+2018 PDF link annotation
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/45028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456420/normal_60579d70341b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480880/normal_60067773c1869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5fe1b12e6f63c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6018632901190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5fde48fa83874.pdfIn PDF document text
    • https://farumurul.weebly.com/uploads/1/3/5/3/135326432/jamurege-bukakef-nuwalejozamejak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5feea0d1472d8.pdfIn PDF document text
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/mixamozudedem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5ff862af427ec.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/how_to_sync_skullcandy_soundmine.pdfIn PDF document text
    • http://copyright-services-us.com/what_personality_types_get_along16w8e.pdfIn PDF document text
    • http://apsmall.space/rejepeness5w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490757/normal_6004559f82c81.pdfIn PDF document text
    • https://demuvejujewik.weebly.com/uploads/1/3/4/0/134042515/c0d3c8.pdfIn PDF document text
    • http://helpcreditscore.info/toyota_techstream_2020_download_windows_72dh2w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fd9f25141a39.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/xovanakijog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_602a961a0c79d.pdfIn PDF document text
    • https://xuxerativizujaf.weebly.com/uploads/1/3/1/0/131070719/bobolixalog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ff860787132e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_604ba7e1143b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd83fc61bf6d.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/magic_treehouse_book_series_reading_level.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxufazekez.atwebpages.com/application_of_computer_in_education.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_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 5468 bytes
SHA-256: fc6591aa59865f019162847466bbc05b0d54d14edb3ae54eacd741b76efba6cf
font_01_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 11380 bytes
SHA-256: 2511971e7a68ae5d09bef89e15dbb998d4f12afea87928ad2641f900fd67e2b0

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