Malicious PDF — malware analysis report

Static analysis result for SHA-256 526303daee9ec1d5…

MALICIOUS

PDF

85.2 KB Created: 2021-04-04 04:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 12e79fdebcc6289035dc630572cde567 SHA-1: c5f24304eb1002941d9c6df397aaa969c2a85f84 SHA-256: 526303daee9ec1d5df9873da79acbe14790a34daa979a2601d55597ebfbbfcab
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Monopoly card game pdf', which is likely a pretext to drive users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=monopoly+card+game+pdf In PDF document text
    • https://cdn.sqhk.co/noretokujazo/qjenhgh/govekofesavezotomid.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/e5RJHyv/throne_defense_madden_20.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/zidRgdF/rollercoaster_tycoon_4_mobile_cheat_codes_android.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/iXgcRhf/15492818071.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/8923192154.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/fVczety/zanekikefebigoti.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/9N2hf2h/20239800173.pdfIn PDF document text
    • http://xusakarezexalu.iblogger.org/18882340300.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/hR4ggig/percy_son_of_zeus_and_hera_fanfiction.pdfIn PDF document text
    • http://wirufebo.22web.org/lexorodizifu.pdfIn PDF document text
    • http://mists.space/android_screenshot_settingsxw9ky.pdfIn PDF document text
    • http://spiritstudio.ru/inner_sea_world_guide9c4rz.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/8jihjge/4_pics_1_word_photo_album_cd_case.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/jhWzUjj/diamond_pickaxe_minecraft_dungeons.pdfIn PDF document text
    • http://fringigejy.site/motorola_cp200_programming_manualblah9.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/page_break_inside_avoid_dompdf.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
    • https://s3.amazonaws.com/xidazeze/69969165478.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/high_yield_pediatrics_shelf.pdfIn PDF document text
    • http://fafuwite.epizy.com/nepaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/how_to_use_tags_in_sketchup.pdfIn PDF document text
    • http://bugixud.epizy.com/invisible_man_chapter_13_questions_and_answers.pdfIn PDF document text
    • http://xedorub.rf.gd/ffxiv_leviathan_extreme_solo_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 5064 bytes
SHA-256: 22fca0edcddc3074fa79916c8a7081736251117ae860aabbb63982870b8b0f15
font_01_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 10580 bytes
SHA-256: f38bb3625070736ec9b9515796e8cad224b99dc858eccb72f158015f4cc4caca
font_02_sfnt_off000139ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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