Malicious PDF — malware analysis report

Static analysis result for SHA-256 984915adb1c55113…

MALICIOUS

PDF

76.6 KB Created: 2020-12-21 19:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e9511da578d991c08fc6de8a6e5dd17b SHA-1: 2c3e2bf735102afbbe508ba6d1b25496489294bb SHA-256: 984915adb1c55113c3f33663ea1927f5d6fb49267be2f90e9db7b83cc887a980
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/aws?utm_term=brighthouse+financial+life+insurance+absolute+assignment+form PDF link annotation
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/xeganameguxiga-damud-lujogame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5f99717e025eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fc6cc6ba054e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5fcb0fddddb3b.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/3854900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_5fd26a20110cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5f91b68835ba9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tarajix/71552880118.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/ac_market_ios_11.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/pidumerobigedawidotof.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/cdigo_penal_comentado_bitencourt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5834cff13940aa25ecd35/t/5fc7db4a68a3ad1e411fb41a/1606933322701/smash_it_up_part_2_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/employee_awol_letter_template_uk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 5364 bytes
SHA-256: 5d43fcc5cec8b26588fecac2226d329fb461e042056c10bf084519a8f8ce9891
font_01_sfnt_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 11092 bytes
SHA-256: 55a2b9b52820a86274e4780bb8a2b85a2e970ffd1ab0e5a9b03307a8d1443997
font_02_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16080 bytes
SHA-256: 01918ab328aad74c9e8f640f01f786fd0c2e0e9f3673bd8045474dd117871356
font_03_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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