Malicious PDF — malware analysis report

Static analysis result for SHA-256 6414ed16c7a70d97…

MALICIOUS

PDF

107.7 KB Created: 2021-04-08 23:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9d4c895173686e6c15ec3ad057980100 SHA-1: 6d99d3c9d501c961ffdeaf1284743dbc70f05a2c SHA-256: 6414ed16c7a70d972416f91c11d2f77d21a85ed0f02398d6b2e8272b9f160b81
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text referencing "4 pics 1 word" and a URL that appears to be a redirector, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://jacksth.ru/strik?utm_term=4+pics+1+word+level+2781+to+2800 PDF link annotation
    • http://gubevexezu.iblogger.org/mekujenopisul.pdfIn PDF document text
    • https://nidegezepon.weebly.com/uploads/1/3/4/6/134650885/d95f8f053df.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/dokaleg.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/bodyfit_by_sports_authority_stationary_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/cFmXhci/woguwosu.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/types_of_bitumen_test.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/Ghfeu36/today_s_weather_report_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/jCWWuB8/takeout_restaurants_near_me_open_now_current_location.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/Khc3ih8/8809337205.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/je5alji/vupativuzesepuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_606aed1e4d4b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_601ed2ede156b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_5fe7857e984f7.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/ignou_mcom_assignment_2020_20_solved.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_605a3ac0263e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusababi.onlinewebshop.net/the_solution_of_differential_equation_dy_dx1ex-y_is-.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/ryobi_bench_top_drill_press_parts.pdfIn PDF document text
    • http://walizuwimubipof.rf.gd/70257001755.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/jellicle_cats_lyrics.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/probability_questions_and_answers_gcse.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
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 2952 bytes
SHA-256: 18f3dad90f0b8a749557125039a501166b605b51d41492c5c2dfd7e147c8bf53
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 5600 bytes
SHA-256: f63776e2b9d7a408201749b328aa9cc43b61941a2f6119b321b5dd379c3dadc2
font_03_sfnt_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 7452 bytes
SHA-256: 63e075000b727799410128ff9e090812d8e35fa181f6319d1df77d7fb83eee9b
font_04_sfnt_off00015ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC3 13120 bytes
SHA-256: edd9edf7d71ec629b89f374c1f89b89298c8a43c64485a7d50579a29620d272c
font_05_sfnt_off00018a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A8A 16144 bytes
SHA-256: 8c39bcce0c6a74cae00f8316c78f6d151a15ecf061f6a9fbbe29b0beba59a43d