Malicious PDF — malware analysis report

Static analysis result for SHA-256 3585e514c4c97b16…

MALICIOUS

PDF

100.1 KB Created: 2021-03-27 22:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ed06254c75c498a76d1d9c4656724046 SHA-1: 7f63869e0b3a2d9992ec039dbda48d3688e72956 SHA-256: 3585e514c4c97b16f3f4cb378aa01c29fb9f9673ca2c2c5f7a100e491cc08d88
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it contains external URIs and is part of a link farm on disposable hosting, suggesting a phishing or malicious redirection scheme. The presence of a 'download button' lure further supports this, indicating the document's purpose is to trick users into navigating to a potentially harmful URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=infinite+geometric+series+calculator+sigma PDF link annotation
    • https://cdn.sqhk.co/latusetime/bGhahd5/condado_puerto_rico_furnished_apartments.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_6031d0d0dec57.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/retinitis_pigmentosa_adalah.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/gokedejepekekiju.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_6033c4ade240d.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/hypothyroidism_diet.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/was_it_a_dream_short_story_theme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5ff694384e94d.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/vjdz2jb/42020363147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fe550e6791da.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/R4jcgfE/cat_mario_linux.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/exemplo_de_caderno_de_encargos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_5feaecb507f40.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/lDichcD/89146481048.pdfIn PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/introduction_to_entrepreneurship_noun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalirabagetovop.epizy.com/vizio_sound_bar_subwoofer_setup.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/dj_bravo_dj_bravo_song.pdfIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/water_cycle_reading_worksheet.pdfIn PDF document text
    • http://vidabovon.epizy.com/hipertension_en_el_embarazo_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070cbcb0-42ce-46d5-94bc-2318e15f2540/gudoserexapagupefexijawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02db03c3-90e8-4ffb-a109-bbc52ccb2053/feldman_2019._development_across_the_lifespan_9th_ed._revel_access.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/apics_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8e30a0-bd5f-4933-b0e3-414d9455b8bf/nujapi.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
    • 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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16080 bytes
SHA-256: cea58521bab7fb576397045570b5d1b18294361bb6dec76054cd5527ef3cb4a4
font_01_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 5140 bytes
SHA-256: b07b4467b894d1678499f41aec6822d4a17cff6f261416eea45f65db1e4d3937
font_02_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 3796 bytes
SHA-256: 16bb9c3919b421517bc335409dd1a08680d5d5fd213b1232d1f1dc44e95f6251
font_03_sfnt_off000141bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BD 11440 bytes
SHA-256: 10dd2df7b254e845769bf7ebb7e02bcd1578c60d053f3e5ef50bc10122d52069
font_04_sfnt_off000168fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FB 16564 bytes
SHA-256: 2aa509edc22bd4fd1d715654c24b502f7639896aac46af6f0f8b446ca50495ac

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