Malicious PDF — malware analysis report

Static analysis result for SHA-256 923d228de7be02ec…

MALICIOUS

PDF

87.3 KB Created: 2021-03-22 06:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 99ec18b86066df33c2d4131441a3358b SHA-1: 7216ca52a3a1e5e4ba6c2e700affa853072528e8 SHA-256: 923d228de7be02ec6d6b97c4fa0da1b5b774521db5fb5490f1063da4597aa9b8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://maypoin.ru/123?utm_term=adobe+spark+apk+crack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366965/normal_5fcf28070d451.pdfIn PDF document text
    • http://rusidaf.22web.org/fufopapigodutotokekezoxoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/fjeO7j8/pidera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_6002b7bd15249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_60246250cf524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5feb5e7f93159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422912/normal_5ff17c7e64498.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/bzVXji8/morifigopavajexusiko.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/cijidYC/answer_key_hssc_clerk_23_evening.pdfIn PDF document text
    • https://cdn.sqhk.co/fijufupuga/gpFjbic/92058197100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_602b7fbdcb93c.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/pasawexawinogad/i_am_not_perfect_but_i_am_honest_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ba1b59-db09-4111-811c-cf307b31b048/moxafuged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9189fa-63ba-4b91-919d-46297d4b5747/toro_brush_cutter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9a7565-9fab-4643-ada4-1d1b9ea962ae/saxefusofalanuvawin.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/58770701768.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/billings_method_of_birth_control.pdfIn PDF document text
    • http://sidukumu.epizy.com/conjunctions_exercises_with_answers_doc.pdfIn PDF document text
    • http://liroporegabofi.epizy.com/bad_blood_secrets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 4780 bytes
SHA-256: dbd10e12debe57ce7216f3edfa818686484fe0eeccf265811571eca1cf9038c2
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 21724 bytes
SHA-256: f4ac0605891233d7d3fc90e58cd2b86d811ddfc29cd52867ee3d75645ead863b
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 16068 bytes
SHA-256: 912e8c3c37b183d760f7f382ef110bdca05c7793b62d2efdd5772423ec248018
font_03_sfnt_off000141d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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