Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af1a8bb0991c95c…

MALICIOUS

PDF

100.2 KB Created: 2021-04-01 20:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 12096c47b3d681bb0cd7891bf33bd602 SHA-1: 912e25073a4fdd5da9fdc7110ffc48a34fd547ed SHA-256: 7af1a8bb0991c95cd01cec3130e023af49d5904878772c8b0f16f83440d20750
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to malicious content, likely leveraging a client-side exploit or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://golowaki.ru/strik?utm_term=sb+800+flash+duration PDF link annotation
    • http://bavewemelemare.iblogger.org/95100044162.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/dfgxjap/90191476794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_6020968ac4c1a.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/how_to_facebook_message_recovery.pdfIn PDF document text
    • http://vas-rem.ru/diwuxi4c7r0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_60566006c89b9.pdfIn PDF document text
    • http://jadaribod.mygamesonline.org/viduxuverobebisif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_604056cd53238.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/1kijHgg/adobe_camera_raw_photoshop_cs2_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/h4ji2hE/finger_guns_gif_spongebob.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/jPkidpd/25497582485.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/gdkjfJv/battle_royale_3d_warrior63_apk_obb_download.pdfIn PDF document text
    • http://korixoludofuguk.scienceontheweb.net/kovenedaledazasividi.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/cardioplegia_del_nido.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5fff0198105c4.pdfIn PDF document text
    • http://idealica-co.site/peak_scientific_nitrogen_generator_manualfjwgm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://popupigewomuri.rf.gd/video_trimmer_app_for_android.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_c5adfa2a8a9f455aa528985c8b15db40.pdf?index=trueIn PDF document text
    • http://nasakitubaribud.rf.gd/54579307061.pdfIn PDF document text
    • http://damowepoko.myartsonline.com/what_is_junie_b_jones_books_about.pdfIn PDF document text
    • http://wubixulazig.rf.gd/g_shock_ga_1100_1a1.pdfIn PDF document text
    • http://gorevifero.epizy.com/asalem_jarigindante_book_free.pdfIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_1afd27f666c64672ab76fc09735d135b.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 5340 bytes
SHA-256: 585ed654cb79d640ee79d1a1f65133ef364a12e2039fa8c012dadcfbf81c7e3b
font_01_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 6096 bytes
SHA-256: 6553810983eb2c217da1baa9f4fc386ec09aee045bc5b1454cc045cf25198219
font_02_sfnt_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 11692 bytes
SHA-256: 70b46a1a54d0b3c8a002b24b99481ca17e8ac1e00129c1d5fa37bd551dc42fc6
font_03_sfnt_off00015f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F24 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_04_sfnt_off00017453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17453 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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