Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ec261956e06649…

MALICIOUS

PDF

129.2 KB Created: 2021-03-26 08:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 504bcf948922d8b431ba65915f9ee76e SHA-1: 6861819de80eb92302e221d6b87d4f597c627d33 SHA-256: 28ec261956e06649b65cd073ceb0ea9ccbc99c632e220f56e9a8ed2273a62379
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/award?keyword=infarctus+du+myocarde+pdf+gratuit PDF link annotation
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/1736035.pdfIn PDF document text
    • http://sovetnik53.ru/judge_judy_bailiff_payrr5d2.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/12754848060.pdfIn PDF document text
    • http://premium-cinema.com/987392562684nfxp.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/thule_roof_rack_for_jeep_wrangler_hard_top.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/xat_verbal_ability.pdfIn PDF document text
    • http://shmelev.pro/87256476211lz7bw.pdfIn PDF document text
    • http://ergors.space/big_helmet_heroes_mod_apk_0._4._03r57l.pdfIn PDF document text
    • https://vaxudiku.weebly.com/uploads/1/3/4/7/134709892/5354190.pdfIn PDF document text
    • http://idealica-co.site/22495261523amkfc.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/judiwet-sizokesezujexe-karesafunaf.pdfIn PDF document text
    • http://domensita.fun/jepapolojimaz1jsai.pdfIn PDF document text
    • http://temivenoni.iblogger.org/android_tv_box_remote_manual.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/9635268.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/7402227.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/49386965229.pdfIn PDF document text
    • http://usacreditreport.info/38014490498idlgs.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/medical_report_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafiwepamubov.atwebpages.com/galodigonebapade.pdfIn PDF document text
    • http://bofawujataja.epizy.com/the_little_red_hen_printable_story_book.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_f6509ec263c34f919f5d16f3445479a4.pdf?index=trueIn PDF document text
    • http://jelirasu.rf.gd/how_to_read_judgment.pdfIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_6d18ea7f23844642a33a283c524e3045.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_b0b3c6426fa342c7ad083174ad00689c.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_fcb1beb618e04e42ab42ce9e8c0e5fc6.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_off0001a49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A49D 5484 bytes
SHA-256: 1c3ab6e8310d8d743c781409f8989a39a78cdc81533f76d0ee60cebd790a8cc7
font_01_sfnt_off0001b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B73A 12784 bytes
SHA-256: e8cb6dde305e0c13c773f65bb66d1199ccb10d059b3e3e1db3fda2de31b4fef7
font_02_sfnt_off0001df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF52 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501