Malicious PDF — malware analysis report

Static analysis result for SHA-256 928faa84c4d2d395…

MALICIOUS

PDF

70.8 KB Created: 2020-11-13 20:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d44f1ca650c6165bd2986a95ccf94e87 SHA-1: 917d95f3455cd5a33d32c81731cbbc0dc33e6bf2 SHA-256: 928faa84c4d2d395f363e93f9697a55d1eaca49eaa32b4bc025e0e49e90bea48
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://trafffe.ru/123?utm_term=starbucks+failure+in+vietnam PDF link annotation
    • https://watinadapazibe.weebly.com/uploads/1/3/4/4/134492378/xigadisukazetumeneba.pdfIn PDF document text
    • https://lisefemibumosu.weebly.com/uploads/1/3/4/3/134339955/8659590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_5fa83ec228444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5f90b4678d3c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f8da18885a99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fabb277512c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f870bb580dee.pdfIn PDF document text
    • https://nigokozop.weebly.com/uploads/1/3/4/4/134436215/5407639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f99d9b880249.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/40513.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/04929b00-4f76-4622-a4d8-678d55f94f8e/mosaic_slime_slime_rancher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31885dd9-f82e-4809-833c-a56620ca25be/rovisixegoniradoke.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/appareil_urinaire_schma.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/african_queen_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce851e6-724f-4d71-8beb-a449cba4e47f/13343896477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1f0bbe-741c-45ab-9fd1-838f6924293f/xedejipulo.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 5396 bytes
SHA-256: 834ec4386f2919ffc3a5b705dfc677e13f0fd5497608d53407899af6106fe17f
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 11940 bytes
SHA-256: 22e0edd55f12db5454c263a937b16199d0a01fb91a8f58c6458a2d6afb489d3b

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