Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e521e1bdfc90f5…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 21:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0817a103302f5b2caf09e424cd7896c8 SHA-1: 133be0fa47a05c69fe9d50b0d57f1c2292766be5 SHA-256: 44e521e1bdfc90f58b608f61c7a32e5d78f02b874518dcc5e61f10963808614a
186 Risk Score

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 0.9996

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://ponafet.ru/wix?keyword=sanyo+air+conditioner+remote+control+manual PDF link annotation
    • http://vknart.xyz/24108812508xjlzn.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/6150798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_601d05a421be5.pdfIn PDF document text
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/9b0c3b.pdfIn PDF document text
    • http://select-get.top/50247255693tbj4v.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/3617448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_602ff7df50136.pdfIn PDF document text
    • http://brightshopbg.xyz/43075421866sry7k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_6049706531389.pdfIn PDF document text
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/tulubano.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/how_to_reset_angelcare_monitor_ac401oezsh.pdfIn PDF document text
    • https://givenuwijuzi.weebly.com/uploads/1/3/4/4/134445792/gebafoxasiximime.pdfIn PDF document text
    • http://igbusinessabouthelp.com/81753907601bla34.pdfIn PDF document text
    • http://hookup158.fun/saat_kavram_parmak_oyunutt8t4.pdfIn PDF document text
    • https://mejidoxele.weebly.com/uploads/1/3/4/3/134320803/a855f0f1.pdfIn PDF document text
    • http://useraisins.pro/air_force_academy_sat_subject_teststfr91.pdfIn PDF document text
    • https://luwibizikowar.weebly.com/uploads/1/3/4/4/134483868/8680657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_76f4487c7d0948f58c8c971dfe578141.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_46a9f91ef7134958be4971686a9f1778.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_3f5a130f0e154298824fb6a228802513.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_2c11118d23e3431ca58eea3648343143.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 5112 bytes
SHA-256: 29968a5f40aedf3b16a05a3e61078877de88f2fee45d7126d522f181cc149049
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 11072 bytes
SHA-256: ae257311367448f29c7a74e04e0e7105203370d248f7a4667b14c04a04a00ef3