Malicious PDF — malware analysis report

Static analysis result for SHA-256 33521a8a49754cfb…

MALICIOUS

PDF

76.9 KB Created: 2021-03-12 08:32:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b60097cc15e5f8987b2b76483a2085dd SHA-1: 4b06e237849219529362d3d397a4afe9d00ebb23 SHA-256: 33521a8a49754cfbfa428ecd19cee22f869caad6a8485dd44f5107f46cd90590
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, indicating it is likely part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure suggest an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=the+saffron+wave+pdf PDF link annotation
    • http://ledozikatiresev.scienceontheweb.net/35905384170.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/mental_age_test.pdfIn PDF document text
    • http://mozaduz.mygamesonline.org/fetal_warfarin_syndrome.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/30697218315.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/the_lover_marguerite_duras_free_download.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/medios_de_comunicacion_oral_escrita_y_audiovisual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/is_the_canon_powershot_sx540_hs_a_good_camera.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/73638083985.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_66ea27581e7d4747bf1c947647b4cc84.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_790d6544a5af44b6bdd11c9cc9bd11ed.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_19eae9368ac744a1862c40e29edba02f.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_b419fc21c9624b46a6961c0b44a55cd4.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_0e83410c6fe2498eafe9ae8d4a228682.pdf?index=trueIn PDF document text
    • http://tizexazebubo.atwebpages.com/short_biographies_for_middle_school.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_b74f37b62879495a8b1a377adf3453d0.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_ad392f7d89e440abb5880b8a9bdfbe7b.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_1d526dfddd4143be97b46b5763bc77a6.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_4ee551c4ab714310b1000a8757cfabef.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_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 5196 bytes
SHA-256: c77e2658f7a9936a959be3993e6d8c22603a0782ae257c9958d11b7fdf73c41f
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 10240 bytes
SHA-256: 5ab8c63e5c0d2d1304ee90c6af89a43f0148fdf3b2adc93db265203f846352e1

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