Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ffe045927b41be…

MALICIOUS

PDF

71.9 KB Created: 2021-03-06 20:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 245b93e08dd9d603fee4c2e214dd03c7 SHA-1: ff5e8dc67d799df81fdc3506ad651981f8cfe54f SHA-256: 12ffe045927b41be4de57d679e259c0c93b606cfa692a25ee873d90f5c9cddc5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, appears to be a lure related to printer ink, directing users to external sites. The presence of multiple disposable domains and UTM parameters suggests a phishing or spam campaign.

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://soxebez.ru/strik?utm_term=what+ink+does+the+epson+wf+2850+use PDF link annotation
    • http://nosixavol.sportsontheweb.net/14077520241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446263/normal_600925e0e1b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_6014209abcb20.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/EQiiHhj/11615041892.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/82949701708.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/64564370490.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/what_age_is_a_court_of_thorns_and_roses_for.pdfIn PDF document text
    • http://reform-st.ru/xuwobatonunuvu7hj76.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/KjfcFGS/84552533673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fc5f7bc4d3df.pdfIn PDF document text
    • http://webdefilmizle.com/700487972732u7yz.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/zesojasunetoxajilidofo.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/the_law_of_the_garbage_truck_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipebevu.atwebpages.com/how_to_reset_asus_router_factory_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/candidiasis_oral_pediatria.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/zibibumubida.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/senegaloxunajeduz.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/wotirazazu.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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 5764 bytes
SHA-256: 349537738dcf1097128bb073bcdf2ea9b107ca4d5d3bba2a3febc7e42edc835a
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10884 bytes
SHA-256: 92d0d849ca91678aa879724e36228b101afe2f4fb0dbfb1628ea5b60906ca6fb

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