Malicious PDF — malware analysis report

Static analysis result for SHA-256 577d7b9d40f0d8fe…

MALICIOUS

PDF

61.5 KB Created: 2020-11-23 02:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 071c1682ba1989a08c6aebf32165a775 SHA-1: 95e96fdff8cb7b93fba86e8d62a845ad1b9d2922 SHA-256: 577d7b9d40f0d8fed424b901fb3e6fb8818427cc7b8f59dd0adf5540506546fd
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 0.9992

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://trafffe.ru/123?utm_term=whatsapp+handler+apkpure PDF link annotation
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/755229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5fb87cbcd5e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f9a9e622cc0c.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/jamuluvuvava/56483387911.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/irobot_roomba_550_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/56544005280.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/100_complete_botw.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/borchardt_c-93_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b1674c-da0c-42dd-b9fa-719dfb917720/debedumasugonufivoxulojef.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/3507020405.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA516 5124 bytes
SHA-256: 9ae18e45946164ebc36dae42afa5d94cbf313e940b47e88ac53cf8f26666ca0a
font_01_sfnt_off0000b686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB686 8672 bytes
SHA-256: d18e3f075e480f6f7cebddea43dbb991c175591d03e8a8c02827723e561ccab4
font_02_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 16124 bytes
SHA-256: e9bc778c3b65b79f54d456b1d21f0ab37f3a62dcf8da49c2887d05da31f64424

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