Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a011ffa8a1301a6…

MALICIOUS

PDF

74.2 KB Created: 2020-12-24 15:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 79a45faa4da626cd575514d107417b06 SHA-1: 9877c17771bf537365c3d7f2071dd8013b7df638 SHA-256: 9a011ffa8a1301a682374c22b5441a276b62da7bcc065933c0977e906d67cdd3
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://traffset.ru/strik?utm_term=dirty+air+control+valve+symptoms PDF link annotation
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/5842875.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/5416418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe57f02-d107-463f-8355-090b1b3ff351/47812235363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c50931f-30db-442f-a72e-ffe5607761bf/alera_elusion_series_mesh_high-back_multifunction_chair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/bollywood_movies_music_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c02c245-894a-405d-904b-7efbe77f1280/trig_functions_identities_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60ba0dd-6f7f-4fd6-a469-7b8f805d3146/wikajamogojuguvumivov.pdfIn PDF document text
    • https://s3.amazonaws.com/dirijazi/80055491628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71adce47-8118-4a7e-add3-a97e469a115a/autocad_2007_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/business_intelligence_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ca9de6-39d5-47be-94fe-c34f9875b1d8/76369588187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da81dd9b-dbc6-423e-b862-62d0c3c36c68/zexomix.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/ripijowofefoxufowivov.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/pdf_to_word_ocr_freeware.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/18832130589.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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5240 bytes
SHA-256: 7dcdc0dd6d1c0750b8003cc516f2c840576ef237bbb9ca21c639e308febfb3d5
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 10620 bytes
SHA-256: ed0047d9047bc622389341f521f3fac34624f8a075de23b7b4dff680dcc00bac

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