Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab548df633dbbb37…

MALICIOUS

PDF

91.5 KB Created: 2021-05-31 14:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 993dd38f7dfa7b2902e73d2a2c58478a SHA-1: b427b69bd342336752c661957983c50b5c288684 SHA-256: ab548df633dbbb37106dd4b0b534963e0125779dbcfefac186ef74f5ff237537
164 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_SEO_LINK_FARM' heuristic. One of these links, 'https://xezojetit.ru/123?utm_term=android+sqlite+foreign+key+tutorial', is flagged as unknown reputation and is likely part of the malicious infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this document, suggesting it is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/123?utm_term=android+sqlite+foreign+key+tutorial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489412/normal_605b929ad6cf7.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/b654bc2aefd7fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_606e8bf38e57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_6020d54aaa07b.pdfIn PDF document text
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/fexeda_lerebiten.pdfIn PDF document text
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/9303406.pdfIn PDF document text
    • https://sojinunanujiwok.weebly.com/uploads/1/3/5/3/135311630/1579360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_603e242678667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_6014cb92480c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_606c78895abb6.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/687ac788-ef1c-4ba1-be18-0658385f33ba/duramax_diesel_engine_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f254f9d1-ddab-4b98-a293-645fc29d29d2/98343046946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b28fe51-b0cc-4817-bdf1-c64b0e48c8f1/evaluative_reading_comprehension_questions_for_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aded7a0-d532-4986-8be4-170f47cc8cf3/best_place_to_play_fantasy_football_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a66595-805a-4556-952c-d0d1fa4854bc/48866424855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a93436-708a-45d4-a9ab-fb227a22d9c3/boxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040f17c6-7c4f-4fee-88f5-e02ecf5cfed1/the_metamorphosis_sparknotes_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d56483-b8d0-42dc-b274-893a2f5848d9/13766009836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc97c6d-3fe7-48c5-bb2f-dc346852e05b/crochet_video_left_handed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5772c93b-8ead-4c1e-9d1b-779eb3d6a928/how_do_i_reset_my_unifi_gateway_to_factory_settings.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_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 5356 bytes
SHA-256: 3d2427a2d57d018cf333f97db0d29377676844044086b1da1e211d22daad3753
font_01_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 11816 bytes
SHA-256: 38c1940fe1b2527158a255a7d6c05ae0be7db8e90f03a98fce2fc1093049ff05

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