Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27240a897f64cad…

MALICIOUS

PDF

89.7 KB Created: 2021-03-19 04:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8d8408f6a96e466a8583f1bc6222aacc SHA-1: 27000f6f88e427aa6197a1a3dbb9f8a483104250 SHA-256: c27240a897f64cad414dce4b60588b30d47cfc668c15acc181f93894ae7cf435
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm hosted on disposable domains, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a movie title, potentially serving as a lure for users seeking specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://zajinet.ru/123?utm_term=bourne+supremacy+300mb PDF link annotation
    • https://cdn.sqhk.co/bozogekeji/CLif9qa/macos_set_default_music_player.pdfIn PDF document text
    • http://domavera.ru/zepifo4gshu.pdfIn PDF document text
    • http://kewotij.mypressonline.com/moment_of_inertia_of_solid_cylinder.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/parte_accidente_de_trabajo.pdfIn PDF document text
    • http://firstflirts.site/ch_play_ioskb3ow.pdfIn PDF document text
    • https://cdn.sqhk.co/zigimovovu/hbjehfk/puzofutekebulusexuxi.pdfIn PDF document text
    • http://dom-bita.org/nouns_worksheet_for_grade_21ostp.pdfIn PDF document text
    • http://bossyonlinex.com/now_were_stressed_out_lyricss3thq.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/autodesk_revit_architecture_2020_essentials.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/ibkCjje/76510958937.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/shark_sonic_duo_pads_uk.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/jevopezaxut92s3s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinerulekivu.rf.gd/what_are_the_questions_asked_in_capgemini_interview.pdfIn PDF document text
    • http://tapimezekuboj.rf.gd/el_inmortal_borges.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_58cc867313344a16b993959c591171d8.pdf?index=trueIn PDF document text
    • http://gigonusotomofi.rf.gd/95917922383.pdfIn PDF document text
    • http://jagofebasej.epizy.com/wuwovibaxakilodizifotab.pdfIn PDF document text
    • http://zarevamemamafo.rf.gd/referencias_bibliograficas_abnt_formatao.pdfIn PDF document text
    • http://fozabenisos.epizy.com/reading_skills_practice_test_13_answers.pdfIn PDF document text
    • http://bafopivazizaxon.rf.gd/mount_and_blade_warband_viking_conquest_serial_key_2020.pdfIn PDF document text
    • http://tavopaku.rf.gd/mhw_ancient_leshen_solo_guide.pdfIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_a85385b221f544ebab293a31506c8e6d.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 5644 bytes
SHA-256: cec5f6069feb1a9fe945020ca5171822837591d42e4b86fb3dbccb8543ff0c6b
font_02_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 1888 bytes
SHA-256: 5486c1bd0abeaa92abd36d1bee4e961ffa0c4a35e07252aef31d76b6fa745a29
font_03_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 11816 bytes
SHA-256: 3d96c7b96b598c80ab2b117463373f420772a24ae1e92cb137493553365f688b
font_04_sfnt_off0001434d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434D 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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