Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0163b1904f88aed…

MALICIOUS

PDF

114.3 KB Created: 2021-03-11 20:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1f16eb1efcd4c6b2fc18b380fa2d079d SHA-1: 6e85c4083c66b6a4f389b03dea18775f75a61904 SHA-256: c0163b1904f88aedcea9410da2fffb6289faf4455dc7c188da416c3e0576856a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, and heuristic analysis indicates it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/award?keyword=appendicitis+classification+pdf PDF link annotation
    • https://cdn.sqhk.co/zedazisem/hcgjzhj/dodibaginol.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/wenizopiwuriv.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/best_espionage_books_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/bsZqepr/spotlight_century_theatres.pdfIn PDF document text
    • http://rugozuravonabib.22web.org/great_books_to_read_in_2018.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/anna_university_annexure_1_journal_list_2020.pdfIn PDF document text
    • http://magazinrf.xyz/84806981412lys0d.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/64998055540.pdfIn PDF document text
    • http://agent-spv.space/tarogevomizukedipxkduc.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/hheOIif/home_renovation_shows_uk.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/nokirevodusofiganizovuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/uhcYhiV/zufakaviwobivero.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/when_did_the_great_depression_end_in_new_zealand.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/sif20e1/screen_time_app_limit_safari.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/dmv_rochester_mn_road_test_appointment.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/gebukil/fipugoxezusugakubixur.pdfIn PDF document text
    • http://fasadokejofis.epizy.com/spider_solitaire_for_windows_8._1.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/lg_washing_machine_top_load_user_manual.pdfIn PDF document text
    • http://jokosen.atwebpages.com/head_first_java_8_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/how_to_fall_out_of_love_while_still_in_a_relationship.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/kanap.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/66396338561.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_off000185b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185B6 5040 bytes
SHA-256: aa325a1fce61d87ed7e87c191ce1051e2de9888eb3cbeb3a785e8209561ea53d
font_01_sfnt_off000196f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196F8 10576 bytes
SHA-256: 3b2f7b1b3283aab4ff9f1b18e61c838f5bf3ccde21966a18d34ac914eb748932

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