Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d75ebf2765bd50…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 20:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2cb0bf6d176ec528f9edfa1b187fb2d3 SHA-1: 69fe469c1c39fd4c543965cbda956f5a799ebfe4 SHA-256: c0d75ebf2765bd50b4dfc60c53af1944fb1f8d3e376a66ded5d70eab9fb13320
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 a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with a significant number pointing to disposable hosting. This suggests a tactic to distribute spam or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/wix?keyword=que+es+el+llamado+de+dios+al+hombre PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454170/normal_6036731800a27.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/hhxijic/lukevusomu.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/hNhjPja/35041275302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_6028c3d3380b6.pdfIn PDF document text
    • http://sibiwuketilivi.22web.org/how_to_pass_your_road_test_new_york.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5fedbd585c17b.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/jqphdS0/soxikopabazixap.pdfIn PDF document text
    • http://zebatufiduku.22web.org/tc_helicon_mic_mechanic_2_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/rizanatu/mKc2HDR/arithmetic_progression_word_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_60415a33c5dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_604fb491d9c1e.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/cujejeG/49159208222.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/8yfksP3/las_vegas_fun_bus_nightclub_tour.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/jdxgdfs/mebuzuvalelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://raziwisubuza.rf.gd/melhor_adware_para_android.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_7084785803464fd390d0314b189186bc.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_f315fda2dd3d4e75b555cf4c73e00ea1.pdf?index=trueIn PDF document text
    • http://puwegobatove.epizy.com/rafurin.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_a874917ad80e43feba6f51526d89e8d2.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_14e984222f3d4f9e822d6251511d2675.pdf?index=trueIn PDF document text
    • http://zepurudevivo.rf.gd/pomanibopelu.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_442a3c66589d4635b45334af663303cb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 4960 bytes
SHA-256: d70764de15a171afc312ba3948bdb3aa2301273704ab422cae4aab418917510a
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 11948 bytes
SHA-256: 37ca0e316359920547503d74e869207b3f6cf007a0764e359bb959a65953ba1d
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3