Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d1c7da7c16c3b5…

MALICIOUS

PDF

75.7 KB Created: 2021-02-23 18:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a82a1a96196d67030260e07d7a363644 SHA-1: 98ff6f071ee98e861c89b472518c49e43bd6592c SHA-256: 87d1c7da7c16c3b5613d4d67039c779e3c5a9dd59d775cf0fc8537dba2f62c40
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing attack. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic to bypass security measures and download further malicious content. Multiple external URLs were found, suggesting a potential distribution or command-and-control infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://seumenha.ru/strik?utm_term=why+is+my+mouse+not+showing+up+on+roblox+chromebook PDF link annotation
    • http://obzorov.site/shrinking_ice_sheets_and_glaciersa2ysv.pdfIn PDF document text
    • http://onlyforyou.space/jopudeon53.pdfIn PDF document text
    • https://wuneregogituweg.weebly.com/uploads/1/3/4/6/134686440/rujuganeji_demazeliwo_jamapi_junef.pdfIn PDF document text
    • http://tricitysikhs.com/big_ben_reforma_londres7z51j.pdfIn PDF document text
    • https://sizegetode.weebly.com/uploads/1/3/4/3/134309939/pekeguxipufubu-gobilonuv.pdfIn PDF document text
    • http://bossyonlinex.com/54913929537ggbud.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/tudijuwejilatepag.pdfIn PDF document text
    • http://3bki.ru/skater_fit_black_jeansls3h3.pdfIn PDF document text
    • http://0fruits.space/lyrics_video_maker_app_downloadmmgjj.pdfIn PDF document text
    • http://onlinekartiadesi.com/lizikidavev1h2hy.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/hYidf8N/switzerland_vaccine_covid_19.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/tokudapele/gugafapa.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/contour_line_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/gajivupebatuwonew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 5500 bytes
SHA-256: 9a3ae8edafbd654f49ef1420118e12750d9ca9949f022a3343df68fbd3a83ea4
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 10892 bytes
SHA-256: 561c7708f05b3a1b3c8663fd2cd806f02fddb53fb9d78e82e8cff477b90721f6
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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