Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a9ed41653e5e68…

MALICIOUS

PDF

78.0 KB Created: 2021-06-10 16:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 522a68d8dfbbe78073e402fcc0c4a758 SHA-1: c7d30591437e3ca2beb2feb338c520dccd8fbd8d SHA-256: c8a9ed41653e5e681fa5ea65573c5f4fc65ae145d5cac3ae88502547cfc31533
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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/123?utm_term=android+box+4k+netflix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393029/normal_606614b37ef21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_60018830c7fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_60605f23e5784.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/206f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_604ccd687f4a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_60b95084b4fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_6029321c2615c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_605aaa0a14668.pdfIn PDF document text
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/63c52e18cec2a3.pdfIn PDF document text
    • https://domexuvuk.weebly.com/uploads/1/3/0/7/130740212/ronumusokarex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144774267/21376192963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8178aef4-3795-424d-8f3a-63b8b6802e5a/instruction_manual_game_of_life_pets_edition_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5752619f-3f61-4419-9d08-fc277c380a18/how_do_i_log_into_my_motorola_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f9c713-6c26-4cf3-b84a-e845fa3b90dd/transfer_of_heat_class_7_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a811059-5e7b-4c8a-81fb-612047614f4b/nanagoxopavukatel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2074cec-377f-402b-846b-2955c4c1f1e4/bodugonolev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e667604-b765-48ab-b2b0-f0396add2719/jujipusixukusunexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a61db4-8d81-494e-8a8d-2191f535eafc/asus_zenfone_max_pro_m1_pie_update_download_link.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/ubuntu_server_installtotext.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 4864 bytes
SHA-256: ffffec69f76304c2f4e77cf2add7bc8281958b5085f50f242f12a1c58494b1b4
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 22192 bytes
SHA-256: f388038e98fa9d5a61966fd31be1571a52658d23b44acc05ce86d754781a9bc7

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