Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cb0fb26d7c932a…

MALICIOUS

PDF

81.3 KB Created: 2021-02-07 23:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2488fd56cbd0d814d0b1635147e5a9b6 SHA-1: 70995e6015d1a45f474014c55356af67d5ceb7b2 SHA-256: 18cb0fb26d7c932a4fc5764caadb0d4580c92d5aec736869129b13b15c021bfe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, some pointing to disposable hosting, and a visual download button lure. The presence of embedded URLs and the overall structure suggest it's designed to trick users into downloading further malicious content, likely exploiting a PDF vulnerability for execution.

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 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.
  • 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://bologen.ru/wb?keyword=bootstrap%20datepicker%20example%20demo PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/ja8S5ih/netflix_movie_download.pdfIn PDF document text
    • https://modevibivuruwix.weebly.com/uploads/1/3/1/4/131406629/1037355.pdfIn PDF document text
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/47bae65aac1.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/9225802.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/a5cb82bb07b7eb.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/198940.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/402d3ea1c73c.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/3279993.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/fGhiShc/12059972030.pdfIn PDF document text
    • http://roworesezakor.iblogger.org/brother_printer_scanner.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/jahfFEF/multiplayer_racing_games_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fudopalizew/jbYghhb/warplanes_ww2_dogfight_android_gameplay.pdfIn PDF document text
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/zikedujegivu-zirat-tovibofekudofo-zasemabod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibiwoziveva.epizy.com/sapivojujulawonezivotele.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/82258500630.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/99091162977.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/cagliari_napoli_probabili_formazioni_sky.pdfIn PDF document text
    • http://budunasetixap.epizy.com/free_html_email_templates_outlook.pdfIn PDF document text
    • http://favekagopu.epizy.com/zenonia_4_class_guide.pdfIn PDF document text
    • http://kobewanen.rf.gd/jusimonukibimamiwoniva.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5400 bytes
SHA-256: 714491bd5fd7f655c1058bb09f3469584f045f3c6cf8b14cff84b2062f01948b
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 15624 bytes
SHA-256: e950c45086fe49a7fe01ffbc57dc1ecb4fb79a5e64b62716a6f82628a52221e7

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