Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e39d605a1cb88f…

MALICIOUS

PDF

68.5 KB Created: 2020-11-25 06:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a932d29917e7fc9973cef11848465e3 SHA-1: ae54c7f62e3a72b12158e263ca1ed5617fb68eb4 SHA-256: f1e39d605a1cb88fd147236bdf55815730cb041da90e65884217ebfce99091bf
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/strik?utm_term=our+times+theme+song+mp3+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5fb8b9d49803e.pdfIn PDF document text
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/vabap-vikekiwo-noforotifefep.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/larivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f93add7cf8ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/daxumologejaxezekoponof.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ruponeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ad9ed3-ac82-4211-ba88-303f4e203d33/ion_block_rocker_max_speaker.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/bikodajotufasatiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34bbeac2-3279-4c47-805a-115a4f1d94c6/axiomas_de_la_comunicacion_paul_watz.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/braeburn_thermostat_2020_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/26757222392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd126fb9-eae5-42d6-bfac-40346d827c9f/whirlpool_thin_twin_washer_dryer_rep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 7256 bytes
SHA-256: 5135b18c948961dffb8bec093080081dee704159c44f06a71e800d0609fb945e
font_01_sfnt_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 5656 bytes
SHA-256: 5c3c9de933009a3cb17d49880269d98f6da98f600a101848e4c0e844671c8d4c
font_02_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 10600 bytes
SHA-256: c01aa1f7c0f01245180cb0945bd704c071ef44eb44d77177027ee24883b3e866

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