Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b5cda01bb88d13…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 21:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1f3142535f342a97f6cd890ca51452be SHA-1: 8e9b1accbfab67d915a0decfec59f3a0a6087442 SHA-256: 16b5cda01bb88d1339cea9b609e2a6ea7630314b7b0a944c5a4fb70e1fa33fff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to 'fokemale.ru' and a keyword related to downloading a programming book. This, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, suggests a phishing or scam attempt to drive traffic to potentially malicious or deceptive content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/award?keyword=java+programming+language+book+pdf+download PDF link annotation
    • http://voxanasu.22web.org/sentence_structure_rules_for_spanish.pdfIn PDF document text
    • http://olymptrade.buzz/sample_scholarship_application_letterfgkf1.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/gugazovuranutijinef.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/jdYFhhi/bird_dog_workout_clothes.pdfIn PDF document text
    • http://baffer-shop.space/5923406754zaur1.pdfIn PDF document text
    • http://teplotronic.ru/pottery_logo_stampdfry2.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/5jjgfgc/jitujebabumopafex.pdfIn PDF document text
    • http://balifruit.com/the_wedding_banquet_song_sheet_music86gi1.pdfIn PDF document text
    • http://sizixarasejinor.22web.org/cours_de_l_atomistique_et_liaison_chimique.pdfIn PDF document text
    • http://i12tws.website/gujopuxogonevorinegowajon9a5tc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_26688725466f46e2bf921bfa283a99bd.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_f139a5207a00452499ba2a26fcd46bea.pdf?index=trueIn PDF document text
    • http://fokibofu.epizy.com/writing_algebraic_expressions_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af45cc26-4373-484a-bcdf-93004759ad4d/geometry_formulas_for_ssc_cgl_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/rugipegemiwitigavodumew.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_8dca0c861d2347b4b364711248ecc56c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a07ca1b-212a-438a-9503-ea03dad55976/96185513326.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_184ff30b54a74a848a64995e760dd436.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_42eb72f04ed542389decfbaa576803e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/june_month_current_affairs_ibps_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/mundane_astrology_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/basic_spanish_grammar_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e69f324-191e-4dae-95c7-f07f4ef159c8/hp_officejet_6830_printer_ink.pdfIn PDF document text
    • http://xesugowoxufe.epizy.com/boost_android_box_wifi_signal.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/cuisinart_ice-30_instructions.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_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 5528 bytes
SHA-256: f45773cd73113720893c57c53b79d892e16daec1128f60f2af67991c8c9c759f
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 11328 bytes
SHA-256: cc9edcc727b1b4630f5df9cd9e15c9fa142fa1042d8f8290546f19069267a969