Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbfad69764308f7…

MALICIOUS

PDF

86.7 KB Created: 2021-03-17 07:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1ae724d84644d42f7cb954377d391188 SHA-1: f0879eb08ffd0247deb67030a0aa8427296400f4 SHA-256: cbbfad69764308f73d615fe1f740a12ae5dfead0b893176e73ad937322da69ad
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 pointing to disposable domains, indicative of a link farm or SEO manipulation. ClamAV and ML classifiers identify it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious or deceptive content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=requiem+skyrim+mod+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424683/normal_5fdf4c28dc559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_602cf955cf69a.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/jagitofaj.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/fspxNcq/74225942161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcff1270f9dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5ffa936135aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_603df670093da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fe9236360f85.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/61357271356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_6028e29cbd570.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/gg5gjPx/bovutajarudubag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_603f52362f22f.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/hfhgRgi/24791688380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5feca0bef3469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_87aacd82909649c0bb0fb07da3188807.pdf?index=trueIn PDF document text
    • http://lepoxas.rf.gd/judojogabonun.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_7d021476fd0f443ead42c0c3148693cf.pdf?index=trueIn PDF document text
    • http://nelodetasa.rf.gd/gmt_full_form_all.pdfIn PDF document text
    • http://jikusipuxojapu.epizy.com/how_much_does_foster_care_pay_in_texas.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_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 5204 bytes
SHA-256: 02deb5e52d9f1735250d1522d1936e071219962d34e3ae3c4a314c859ceb2466
font_01_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 10772 bytes
SHA-256: 1c8896f797c2a7da090ca2498aff28373b6dda7f3c530198541bd24a9354462d

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