Malicious PDF — malware analysis report

Static analysis result for SHA-256 527b9e6faaf49444…

MALICIOUS

PDF

83.4 KB Created: 2021-02-24 15:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a63382058f1c7b881b69a29e674c7137 SHA-1: 1ee180ebbdaa1e019766f7e38b57eab8aaededfe SHA-256: 527b9e6faaf494443d57201b3ee3776dfe99742bffdd43720eba98347dedc221
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirection attempt. The embedded links, such as 'https://crophysi.ru/wix?keyword=microscope+worksheet+pdf', point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=microscope+worksheet+pdf In PDF document text
    • http://tekplafond.xyz/how_to_set_up_a_charter_remote_controlsnt5g.pdfIn PDF document text
    • http://bonifacy.site/golden_dot_connect_review0apl5.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/hgjbibx/1k_5k_y_10k_run_santa_run_2019.pdfIn PDF document text
    • https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/d357ab24ec.pdfIn PDF document text
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/7426028.pdfIn PDF document text
    • https://xokekujederal.weebly.com/uploads/1/3/0/9/130969763/7147216.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/flowers_images_hd_wallpapers_freee96pc.pdfIn PDF document text
    • http://kino-vezde.ru/suzuki_m109r_performance_partscfc4w.pdfIn PDF document text
    • http://runmasten.online/97151585914v7j6b.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/sewopodulova_kakekix_nuzumowutip.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/jemisajoda/nedesabaxabexobasuzane.pdfIn PDF document text
    • http://visobiwedixupip.rf.gd/sybil_movie_2007_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/adventure_class_c_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/sporting_event_ticket_template_free.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/universal_studios_singapore_transformers_ride_inside.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_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 5160 bytes
SHA-256: fec07c75fb0d5c169c7c6e1674b8ed2b9ce4db3497a171c97fcf99eb1db0ec35
font_01_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 10852 bytes
SHA-256: 23995d7d20a5a53a7ee9b5013cce3104466c0d9bc809f11335b38a9c9dd58a8b

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