Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5739e28f9753a68…

MALICIOUS

PDF

74.6 KB Created: 2021-04-09 09:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4cf86002737b3af2fa8e644c211d040a SHA-1: 548606328320e971f4b49577426d3d340a7889c2 SHA-256: c5739e28f9753a680254131cb75059ffde6d760bba7c92c118cc2ac59bfd7ac6
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 0.9997

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://lozipotod.ru/strik?utm_term=excel+2013+download+windows+10 PDF link annotation
    • https://rojukekodeb.weebly.com/uploads/1/3/4/6/134682316/vamagu-nidopurote-zukiv-zapakexupan.pdfIn PDF document text
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/4052245.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/kakakasaxomar.pdfIn PDF document text
    • https://sojimivur.weebly.com/uploads/1/3/4/8/134883767/midonozameravo.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://regvoolkim.website/dewemokananomabupigazupu8x54w.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/f503f4708bbfdb2.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/gebovanet-ropud.pdfIn PDF document text
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/5890291.pdfIn PDF document text
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/nimesaxi.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/c39ce5.pdfIn PDF document text
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/8541bc4.pdfIn PDF document text
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/jorojezonir.pdfIn PDF document text
    • http://nelitip.22web.org/lefuzilozigefijutex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasikogo.rf.gd/astm_a36_a36m_08.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03aac53a-8483-4bbb-aadf-e157efff0309/feripa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8055879b-8918-414b-933e-9c894a078755/roomba_980_review_youtube.pdfIn PDF document text
    • http://dudotofuzariw.rf.gd/round_table_talk_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778fe39e-0c16-411b-aa70-7f54383d9b83/74937322622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb3a467-8b02-4048-a5cb-1d9fb22d6f6c/attack_on_titan_season_3_part_1.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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 5444 bytes
SHA-256: 901e9318c2c42a301ab2a16f8f7d1bd7477c8f3839293729c74f5d68392cff59
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 10340 bytes
SHA-256: 760615daa724fc40bde83f23138d94c762e85732b9f85d4951cfda642e92cb22

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