Malicious PDF — malware analysis report

Static analysis result for SHA-256 943c14f42ce40724…

MALICIOUS

PDF

71.4 KB Created: 2021-03-09 11:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b59802299aa7bb7abe399ddfccb7afbd SHA-1: 414cbc318ec49227971037b5a272926150781ba5 SHA-256: 943c14f42ce4072460e6787ba6e65b6fb47f0026542dc64283f44bb9b83ed6ff
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'botokaw.ru' and another to a 'weebly.com' subdomain, indicating a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes 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
  • 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://botokaw.ru/strik?utm_term=kaba+locks+hotel PDF link annotation
    • https://vagibize.weebly.com/uploads/1/3/4/6/134618654/nejuvub.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/black_sayings_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/hhji2Mj/marvel_realm_of_champions_wikia.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/54133538116.pdfIn PDF document text
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/suxupodosepirujum.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/5516900.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/fQwRIic/76411184955.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/which_samsung_phones_support_wireless_charging.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/psychology_books_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9327c877-be81-4e8e-a7de-278e51b97a63/31206940499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef9aae5-748e-4cf1-8b8a-c76c5087e633/towisutumolobasisufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d9ef11-fd88-4066-af64-1fdf768c6d17/les_miserables_book_abridged_vs_unabridged.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/grapplers_guide_code.pdfIn PDF document text
    • http://sogaviwezed.rf.gd/american_psychological_association_manual_of_style.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/installer_android_studio_sous_ubuntu_18._04.pdfIn PDF document text
    • http://nanebovovut.epizy.com/benim_hocam_tarih_soru_bankas_2020.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/hopeless_colleen_hoover_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb32cce0-a4f0-4346-a758-32ff8637ffc7/84798915372.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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 4964 bytes
SHA-256: 87aca32b1b2d286a4e9026b3e86a2a7a48933e28f7dc1b19a1502c2e395c0927
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 10552 bytes
SHA-256: f4de031c8f40b8ca5e4e5f4dcd198ee1aa6dc6382ee2f503af7f3feb9694f3ef

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