Malicious PDF — malware analysis report

Static analysis result for SHA-256 c817176a7ff91ced…

MALICIOUS

PDF

76.2 KB Created: 2021-04-12 21:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8b2d95692a730f55b7f74e40efe71e3 SHA-1: 15f789d29c060c02f8e0d69f1c8388abd9983af8 SHA-256: c817176a7ff91ced88baa26fdaddfc05839a729a20ba4c3f8e476178eeeaff12
156 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 5

  • 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.
  • 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://resalured.ru/strik?utm_term=what+are+the+normal+arterial+blood+gas+values PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500897/normal_5fed4b85d37ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_60155aad30fbd.pdfIn PDF document text
    • https://segukikiregitep.weebly.com/uploads/1/3/1/8/131856439/0f1985.pdfIn PDF document text
    • https://vebokupamo.weebly.com/uploads/1/3/4/4/134494409/515877.pdfIn PDF document text
    • https://dalagusixofu.weebly.com/uploads/1/3/4/8/134853238/23ebb345f.pdfIn PDF document text
    • https://cdn.sqhk.co/sejukuxa/nUM5eP8/nifadenubagegarifur.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/lefad_bemiboxuji_gajilesaso.pdfIn PDF document text
    • https://rizipotekam.weebly.com/uploads/1/3/4/6/134639676/dasujipop-sawovapifozu-nawawile.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/0R0eRjc/quran_tafsir_in_english_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_604b39c2df676.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
    • https://s3.amazonaws.com/laradusa/menutuzumaxuwikojofiwub.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_fb70da0839244aa38f1a86137b681a17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/transition_words_for_essays_high_school.pdfIn PDF document text
    • https://a0e9597c-cfbb-4fc1-b0e0-47ed6411b148.filesusr.com/ugd/24269e_9a84a17e76994dfc967f8e401152efa9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/self_certification_sick_form_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/xodemevanetobewamez.pdfIn PDF document text
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_10a1074046cb42e4bf4e0aa8b7b258ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7a13f3-e6aa-40ec-af9e-008defbabae4/dell_latitude_e7450_dimensions_cm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ee3ba6-3428-4b9d-a333-0cce475d88e1/35836081945.pdfIn PDF document text
    • https://www.cancer.gov/coronavirusIn 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 5332 bytes
SHA-256: 272c02da2290801f29d6fe6b28609b9234111e6af8ce064b9073cdc9317d372b
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10476 bytes
SHA-256: 9fa474c42a4d7a0edc2cc1d85f19b5d604cf354d1d4cd772b385188e14337426
font_02_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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