Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ea379e3ae87e7a…

MALICIOUS

PDF

85.9 KB Created: 2021-05-21 19:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 68a04ce81d24019f0c94954ead233ab3 SHA-1: a34ba118f791a7fed4c254c4e7d3fc7fce1b88bd SHA-256: a3ea379e3ae87e7adc003c755de2626df749dc21f7d4fe84e9c789cdc01050bf
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious and likely a phishing attempt, masquerading as a free download for an English speaking course. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The primary malicious URL identified is https://xezojetit.ru/strik. No scripts were extracted, but the PDF structure and numerous external links indicate a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=english+speaking+course+gujarati+book+pdf+free+download PDF link annotation
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/229a47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5ff82b58bd4de.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/2197445.pdfIn PDF document text
    • https://losujawidejope.weebly.com/uploads/1/3/4/3/134310111/lerejisufudali.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/b6be6614b.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/xelopavi_bivewaki.pdfIn PDF document text
    • https://dakawomafi.weebly.com/uploads/1/3/5/9/135959339/vobenoviketi.pdfIn PDF document text
    • https://zafojulokigod.weebly.com/uploads/1/3/4/7/134741370/diviponafopiv-mejogemediwugu-miwisezut.pdfIn PDF document text
    • https://vogopulopom.weebly.com/uploads/1/3/1/3/131398589/funirok.pdfIn PDF document text
    • https://xidelefexowivap.weebly.com/uploads/1/3/4/3/134366840/bofaninezujojat-piwadene-pogilojofif-musuxesetebopuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491398/normal_6046b2c9d5f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_604adbae5f33c.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/zofepof-regakutuwojo-fofifopimubo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59638b03-9a4f-4d00-854e-ebb67795cbde/67558197130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce6719d-9041-4b78-9148-848dd5abedcb/fakigawemusizawaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b18973-8a54-49fa-84c4-40dd29fbbaa0/64155096191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84176c9d-c142-4535-bc0e-d5255538a67d/77852512151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a131e57e-6e7e-45b3-bc34-c1e0e13d915c/how_do_you_write_a_good_career_development_plan_for_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23969c6-220e-491c-9d1a-6391aa1c96a7/21059346740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92520f15-e7b1-4e26-bf6c-98dc38e6c519/44666848485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcd5f6a-c3b3-4f56-b9a7-b11d95ec061c/49751813789.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 5748 bytes
SHA-256: a26d41c9829a49239a2bbc5246bad771218399558d8847ec5397549bd8efc249
font_02_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 11220 bytes
SHA-256: 539e5cd19c9897e5f9183173e34172ebf51f7baad94788bb18a11df88270ebdf
font_03_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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