Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6524bc40919dc5a…

MALICIOUS

PDF

82.3 KB Created: 2021-05-20 03:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a099c055d97b1d965a2ee210cbbad5a5 SHA-1: d233c453ba7d6a025f1c465c1e9029a968c06f06 SHA-256: b6524bc40919dc5a3e33fa936554907a5b6d08b997879f33ffd5cd721b85b8bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing, with one prominent link pointing to a URL related to 'dragon city hack gems gold food free download'. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a link farm designed to obscure the final malicious destination. ClamAV detection and ML classification further support its malicious nature, likely as 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://leonvi.ru/strik?utm_term=dragon+city+hack+gems+gold+food+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485162/normal_5fffab13c1699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_6047673601787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484143/normal_5fcaef33b0249.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/rakuzanitobigut.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/4791096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5fee7bf78b60a.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/womiwekigobutuputana.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/kudowo/human_skeleton_quiz_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/65967395998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21225ce-9357-4a2e-8b75-84cee33a4c9a/fixurigod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77769c6-8340-4dde-8cd5-efd1a2c7475a/nordictrack_c700_treadmill_motor_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2808da4e-b7ff-480c-891f-3366710758c7/legally_blonde_movie_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c40690-94f5-4d05-954b-b451186de220/90920172713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af850b33-cb71-44a9-8c33-d6f134103093/xotudalexekego.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/what_are_the_7_musical_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e7b17d-8b81-4237-bc86-f685d0cef012/psychology_textbook_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1ed44f-1c46-425c-8783-13e22780d679/5746420483.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/sokukaraxarilidizarabekil.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/chrome_apk_mirror.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_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 5692 bytes
SHA-256: 8012abf5de7c150ed73f2de47c767b25541e3db6032b5322ad03a494f8babea6
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 11532 bytes
SHA-256: e863c30fd01bc8333a6bd9f0272e30a95462b3b5623f378bd587c22c71302850
font_02_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 17112 bytes
SHA-256: 20592f50d76d74ae95aabfd4a3a378359b324a2f9b6dd5e316592271d83ae37a