Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95dd50257881a56…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 13:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7d433ee4d6d576aa561cccd7d0243a7 SHA-1: 016789f687e50a4d4052b926ddcd9005162c2206 SHA-256: d95dd50257881a56cad695e3416d48b4ca315ede839ae64e263dee72452d33f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm with numerous URLs hosted on various domains, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not a typical user-facing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://federicozucchettiarchitetto.eu/userfiles/files/8463392552.pdf In PDF document text
    • http://resumesfromabove.com/userfiles/file/55895313238.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/97348705550.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/32963302349.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/sekofisopexufabuvibawar.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/nemuwesibaposinokod.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/5315528202.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9515f7770ev3k179q8sritl6p7/xasejok.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/tanaraxot.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/jelidofobigupapogagujitup.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/gazirazofategodopezazog.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/litabizetawiduzufo.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/50871729276.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/wurozetub.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/pelut.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/92044876511.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/mababuvesoripomewotan.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/nidulopo.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/4097240122.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/31158470680.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/ronojamefatizajuguge.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/zutekojolaladexub.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lirapakarizipufufetidot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+apps+on+androidPDF link annotation
    • 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://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_off0000aee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE2 16616 bytes
SHA-256: 0f5e6b624aa98eaa60d04ef696e0e3d00cd988079188d3190330383f5e5312c2
font_01_sfnt_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10240 bytes
SHA-256: 16cee41bcd80e118801db651a1f4eec423463f16b32f764b93c2e1e35aeb851d