Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50ac89d15559aa6…

MALICIOUS

PDF

75.4 KB Created: 2021-03-22 10:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6883307122c397a1849ef1c5c0844750 SHA-1: 6a90738a2823bee961fa1644e79206b8e2e20d11 SHA-256: a50ac89d15559aa6704ae2a72651265de13a99012a4d9d1fd7cf3a6ab1d6f7f7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. The document contains a large number of external links, many pointing to SEO spam domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/aws?utm_term=how+to+enlarge+a+rectangle+by+scale+factor+2
    • http://loneresel.mygamesonline.org/neoplasia_mieloproliferativa_cronica.pdf
    • https://cdn-cms.f-static.net/uploads/4417530/normal_6022e6d182812.pdf
    • https://cdn-cms.f-static.net/uploads/4426422/normal_6043763e6a57c.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_604f78ebce4d4.pdf
    • https://cdn.sqhk.co/negapevu/ibgfhcU/the_chosen_book_2.pdf
    • http://vavexefane.mypressonline.com/business_english_course_for_beginners.pdf
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/758342.pdf
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fd2f88ce4b03.pdf
    • http://tokepubex.getenjoyment.net/dewey_j._1938._experience_and_education._new_york_simon_and_schuster.pdf
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/2179473.pdf
    • https://cdn.sqhk.co/wosipuvetot/Jgd02pT/1847314077.pdf
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/murefedoz.pdf
    • https://cdn.sqhk.co/rubutemoxe/gegrvjc/36048359849.pdf
    • https://viwetefebelogup.weebly.com/uploads/1/3/1/8/131857445/muxirivenubisere.pdf
    • https://cdn-cms.f-static.net/uploads/4365649/normal_600ea01698817.pdf
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5ffe07a3c68f0.pdf
    • http://lokubakodo.getenjoyment.net/surah_yasin_bangla_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pokorevalaxex/67694518460.pdf
    • https://s3.amazonaws.com/dazinibonofobi/properties_of_exponents_and_simplifying_radicals_worksheet.pdf
    • https://s3.amazonaws.com/tawovojo/fijovenutilewopolosedub.pdf
    • http://sabixukavizom.myartsonline.com/long_way_down_lyrics_robert_delong_meaning.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e831.bin
5d1c8046e5cfe1ee2d947521bab92188eb30515ee0c71d8e61ee54e0cb99abf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 5476 bytes
font_01_sfnt_off0000fb03.bin
049320a6a94f67898ab8f70006abb24e5450b74cb2bee14784daecbecdfb3911		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 10784 bytes

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