Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b266ad8a705dc8…

MALICIOUS

PDF

76.4 KB Created: 2021-02-17 17:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1302906db439f5e83cc864c38d8a2f9c SHA-1: cb55924e0c4ff44ef9623934f08af457571c2d16 SHA-256: 22b266ad8a705dc83d1ac59525bbbd925e6d3dd94506e17732a3b0ba65199efa
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to educational standards, likely serving as a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jottigo.ru/strik?utm_term=california+common+core+standards+math+1st+grade PDF link annotation
    • http://tvoeobrazovanie.fun/bootstrap_templates_free_for_web_applicationw7jb7.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/jijewaxizesaj.pdfIn PDF document text
    • http://makeyourself.xyz/76976258578rgl4z.pdfIn PDF document text
    • http://karnaval.host/58627876483dzfcs.pdfIn PDF document text
    • http://onlinetyz.xyz/70875685651tv8it.pdfIn PDF document text
    • http://prodive.su/42092414129o8peo.pdfIn PDF document text
    • http://slamelina.website/nobisukomibuseniwuwiky29u.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/036d4beba726cf.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/ijhjjie/infinite_word_search_puzzles_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/3gjcQii/booking_revolution_mod_apk_free_download.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/nopudedebisime.pdfIn PDF document text
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/5178de616.pdfIn PDF document text
    • http://topdouche.xyz/blog_page_design_templatea9gs9.pdfIn PDF document text
    • http://ketousa.site/arkestra_bhojpuri_2017q8x2q.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/kXqyXij/kopabezaw.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/NRiegjI/fememineregagigop.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/muvarelo/a_beautiful_mind_subtitles_english.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/ravobumidefewuso.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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 5392 bytes
SHA-256: daa0c7ad135a4684bb2bf57f46cc974d2aa73ddcb1dbefcecb6349fa02ff79f0
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10592 bytes
SHA-256: 3cd52586cf34aa5363ff3262547aaa9c1591162228ecc505a8081d129e0fc19a

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