Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c88b1dd8f0db76…

MALICIOUS

PDF

85.3 KB Created: 2021-02-26 18:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4aa5dc9457d9b760189e0a63d31d5122 SHA-1: ccd057497be944b6aa7a4f04e9919c2e1c31e168 SHA-256: 46c88b1dd8f0db76120a1c5abe19d71bb24901a26e39203726732f6b7d3593ff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The primary URL identified, https://xezojetit.ru/award?keyword=jack+reacher+books+2020, suggests a lure related to popular book titles to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xezojetit.ru/award?keyword=jack+reacher+books+2020 PDF link annotation
    • https://cdn.sqhk.co/metumolalub/hjhdBQ7/febopavimenosoraxobu.pdfIn PDF document text
    • http://harmony-market.ru/689442971678w6vl.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/hcjcvhb/bomeveture.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fced09618d65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5fc926175feaa.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/f9iggjx/remavodovogexajizoz.pdfIn PDF document text
    • http://rankingcoach-seo.com/football_manager_2019_ac_milan_storys77mc.pdfIn PDF document text
    • http://rollernefrit.xyz/cambridge_10_test_3_reading_answers0i38r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fe55f43c740a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_601be652a434a.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/fjchjaO/edulog_parent_portal_lite_app.pdfIn PDF document text
    • http://itclick.pro/xefozolivinifidit5nn.pdfIn PDF document text
    • http://idealicaitaly.site/semiwelorefasa8wv3g.pdfIn PDF document text
    • http://4338bacchus.com/word_power_made_easy_2019fct9g.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/eYGihii/74267986597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465919/normal_5fee0e80dba45.pdfIn PDF document text
    • http://comp-arenda.site/the_shining_book_age_reviewkd0qi.pdfIn PDF document text
    • http://spainwow.pro/jufulorekaluvepexebifbbz9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6011a759e6776.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
    • 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_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 4876 bytes
SHA-256: e7a558f61e602bd337e30c457bf4495c04a172358b5f8419855d159e95ad1cb9
font_01_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 10748 bytes
SHA-256: a0ab52cd6c2a82ec29e6b029484235f126f0b2f9a04d95297d89276b4a087d42
font_02_sfnt_off000139f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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