Malicious PDF — malware analysis report

Static analysis result for SHA-256 9832b82af4c373a6…

MALICIOUS

PDF

110.0 KB Created: 2021-03-25 09:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 225ad811d801ba49ba4fb59e9fc00161 SHA-1: 8e82674db66279e6ab87a57c51b249d27d172beb SHA-256: 9832b82af4c373a687d3bb47abbe8dae9065584f30624edb43660e1dd80c4bcd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=z+table+confidence+interval+pdf PDF link annotation
    • http://gesemalisezusa.iblogger.org/11463631305.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/index_of_westworldqm5w1.pdfIn PDF document text
    • http://morpeoplelife.ru/luke_bryan_new_video_knockin_bootslc7z1.pdfIn PDF document text
    • http://damvglaz2.xyz/jovuro7io0m.pdfIn PDF document text
    • https://losopaxirusegu.weebly.com/uploads/1/3/0/8/130813120/4415122.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/vanezasemema.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/rawikeberutewovafo.pdfIn PDF document text
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/8717735.pdfIn PDF document text
    • http://jofufuzutaki.22web.org/fomip.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/come_on_eileen_sheet_music.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/laxibavaxot-bodisezofovuz-bonuxir-zitagofinaxide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobakazof.epizy.com/rosodivefafinotirozez.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_27a334c2df3a48b1b3fe16f660322cf1.pdf?index=trueIn PDF document text
    • http://mimelaketikapex.rf.gd/are_coloring_books_good_for_adults.pdfIn PDF document text
    • http://giwifabopamuga.epizy.com/learning_styles_inventory_middle_school.pdfIn PDF document text
    • http://pigibotokaper.epizy.com/7613249870.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_2119918f8e81468c8aeb5f9677b6bcf9.pdf?index=trueIn PDF document text
    • http://xofaxisenulomav.epizy.com/basic_ielts_listening_li_ya_bin.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_a45d986e29ac4bc390adcb8c6c2b16c4.pdf?index=trueIn PDF document text
    • http://tasibufoz.rf.gd/voguxugarirupefik.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_0cff683a02ad46c8a43ec96f4114aabd.pdf?index=trueIn PDF document text
    • http://xadifoduboboriv.rf.gd/51240307544.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_92feaef0d35f4c53a7ba2880fe032ce2.pdf?index=trueIn 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_off00016f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F87 5128 bytes
SHA-256: 25ec712f75ae8597a50f26a939a7ed7a30bc335ede3384db7aeb00ad624e3e0d
font_01_sfnt_off0001810d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1810D 11884 bytes
SHA-256: b373b879e4ee1d1518ab9807245d62e8a45ddd78ea91a8646d6ecc1c2d26dc71

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