Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f993b0f37177da0…

MALICIOUS

PDF

73.5 KB Created: 2021-05-01 19:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cd66c2e648dcb5aac390ae2b9b779a3c SHA-1: d2c5c905478eb00b580a7fa7bf7527273e52289f SHA-256: 4f993b0f37177da01de35e66995c2d4b5883938a1b618ffbc88b069545f535a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with the links likely serving as a lure for phishing or malware downloads. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=d%2526d+5e+homebrew+races+reddit PDF link annotation
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/larugek_guvediduvan.pdfIn PDF document text
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/tozix.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/pioneer_vsx_522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455381/normal_5fdd11d59bc6b.pdfIn PDF document text
    • http://lebofawudire.mygamesonline.org/albizia_falcataria.pdfIn PDF document text
    • https://dolopexoje.weebly.com/uploads/1/3/1/8/131872138/d9515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601146b578ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5fd0ea2a2740f.pdfIn PDF document text
    • http://sinanomi.22web.org/cutting_for_stone_phrase_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426267/normal_6036ae4a3ff6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_605677cb7583a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudowo/cosco_high_chair_assembly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/53792961398.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/colby_campus_map.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/chittagong_college_admission_form.pdfIn PDF document text
    • http://duxuramubot.epizy.com/bluejackets_manual_1943.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/farewell_to_manzanar_part_2_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/free_thanksgiving_math_worksheets_for_middle_school.pdfIn PDF document text
    • http://gazonenewotife.epizy.com/48392117573.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/chain_of_command_diagram_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/45326944998.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/bizasujoge.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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 4156 bytes
SHA-256: 5ae3bcc49c87f96444fbe3d11ff27db43b6aea299416b9f3d286273c64098da8
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10860 bytes
SHA-256: 08ac70e0aef6c0d0751e0a2b0b03b50c67a6a0ab84541ffb3619db9897a089b9

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