Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b77f330c60d66c…

MALICIOUS

PDF

100.8 KB Created: 2021-03-21 04:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cdbec78aaaef756430fb4b2cfa753cfa SHA-1: f977719c43581d212c31f64174e6235f66ce03c8 SHA-256: 69b77f330c60d66c08d160f687f54c30229da67003e00623a46500c78fc289cf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF documents, many hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as suggested by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=plate+tectonics+lab+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476765/normal_60023a50e335f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_604026136fe8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fe1b204ef0f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_600363cbee1a9.pdfIn PDF document text
    • http://flebolog24.com/chemical_engineering_thermodynamics_textbook2hf26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_603211ba299bb.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/lexibuxosaririp-topiwetek.pdfIn PDF document text
    • http://czecheducation.space/kefagezowi0caqd.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/943b4c5189afb31.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/lapobebejozexavaxu.pdfIn PDF document text
    • https://lefofikik.weebly.com/uploads/1/3/5/3/135316562/katifuvowal.pdfIn PDF document text
    • http://karnaval.host/samsung_rf263beaesr_ice_makerx5v7u.pdfIn PDF document text
    • http://xawuzina.iblogger.org/21239098838.pdfIn PDF document text
    • http://bristol-yalta.run/37849650681i5bu.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/13636a47-4cd8-4e38-b475-462a5d587e8f/xukenewokatidari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac899b3-27cc-4a05-b41b-a2f3eaff415f/ingersoll_rand_30t_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a1dc4a-68dc-4c12-87dc-e0dc4d4a4e94/84509531444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dc0d93-4628-47a4-a922-619fa15ef3ca/iomega_storcenter_ix2_manual.pdfIn PDF document text
    • http://tutazex.rf.gd/application_display_templates_liferay_7.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/vokikifuvefolu.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_off00014d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D60 5192 bytes
SHA-256: b6fea45a874191a3a5c4d5376673cf70a8bc11428a5ed0151aa474e57157e19e
font_01_sfnt_off00015f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F33 11248 bytes
SHA-256: b82d71fbafa113da6908c8371124d6dd6f05b674ec8d7cc99dec6bb5988996bc

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