Malicious PDF — malware analysis report

Static analysis result for SHA-256 55551ccf9d9c31a2…

MALICIOUS

PDF

70.0 KB Created: 2020-11-21 07:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f0ae769931d978f721cdd2d4f48fbb3e SHA-1: d16df6a15dd631f29958c9b45352118b5acef748 SHA-256: 55551ccf9d9c31a215b0d3375b3002e790d14786cc85ddb306f1522baefec4ab
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 0.9997

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=parent+statement+for+private+high+school+example PDF link annotation
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/wirejuwewurewi.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/bomado_kajelawo_poresotat_mewunadoj.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/7be9a13e-84a1-466f-9bde-47b5bb97f640/sotefemogovaxivofasone.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/unlock_xperia_arc_bootloaders._zip.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/20371772133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ee7605-0323-43f8-995b-9e45314a0282/how_to_sharpen_a_chainsaw_blade_with_a_file_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/aha_guidelines_ischemic_stroke_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a99b1db-1c3c-4055-abfa-520b90bc763c/70379714216.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/difference_between_centrally_planned_economy_and_market_economy.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/reading_articles_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/ans_l50_smartphone_user_manual.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_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 5560 bytes
SHA-256: bbd6002a38173e38955f5121b7c178099d3feb50b3d1345987a69eb997d1ba35
font_01_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 10824 bytes
SHA-256: e035c1b39d0522947fe70e163968e63e89154f790681b8876383421c51b4b374

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