Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c94745bb662867…

MALICIOUS

PDF

98.8 KB Created: 2021-04-03 04:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ec29c263c014c8c3ef71d1d2f3d68af7 SHA-1: 2552befc190ea4c08ecdd83c4b71c8012a5694ff SHA-256: f0c94745bb6628676600bba271b5359001854bb827d6094db6254ac27c5b09d0
194 Risk Score

Malware Insights

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

The PDF file is identified as malicious by a ClamAV detection and an ML classifier, strongly suggesting malicious intent. It contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure designed to trick users into downloading content. The presence of a 'download' button lure further supports this. While no scripts were extracted, the overall structure and URL patterns point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=english+speaking+book+pdf+download PDF link annotation
    • http://tedamowajowiw.22web.org/63670592198.pdfIn PDF document text
    • http://sivumuvoro.iblogger.org/abdul_salam_zaeef_book_urdu.pdfIn PDF document text
    • http://toxedixekerej.22web.org/apeman_4k_action_camera_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_e5f8eb281708407ebf3e21f7edaddc2f.pdf?index=trueIn PDF document text
    • http://munatom.epizy.com/call_of_duty_2003_for_pc.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_9837cbca58e949f8bea5cc80ffa158a6.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_afd82f82cf7b44929cf032893efa3721.pdf?index=trueIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_5b465d27813240e3b4a74c7ef32fcc6c.pdf?index=trueIn PDF document text
    • http://xogimutidum.epizy.com/54206577787.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_68c41d60b61e4535b42e641afcccc8e5.pdf?index=trueIn PDF document text
    • http://liruselewaviba.rf.gd/siklus_akuntansi_perbankan.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_97f0fa0c5afb45fc8881e58380438ff7.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_4447216b1d6440e484fcb3456b09d0d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f521895-be42-4e02-af0e-3e85aa55fd72/algebraic_number_theory_online_course.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_4a01c72eb64645e698cdf0f3905a975f.pdf?index=trueIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_8572dfb0de5341fa8c9199a6bbe7f31e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e367e4b-cde7-494c-a439-2130df4c49ca/what_do_chinese_lanternflies_eat.pdfIn PDF document text
    • http://sujawusoxenum.rf.gd/habits_and_routines_esl_worksheets.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 6416 bytes
SHA-256: 2c4cd2f1fda7a68eeb81c013192e381dbe8ba147c14f5bbf09a6b7e6fd893723
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 5460 bytes
SHA-256: 831aedae68ea6ccdedabe8b8be4258a4844a5f38496cabe5be373fc3f01715dd
font_02_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_03_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 10520 bytes
SHA-256: 57c17e74decf1a3fb4b836cc28fd0cc7ccbc1f11144493cbc0d71a42852bfc37
font_04_sfnt_off00014c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C83 15556 bytes
SHA-256: a5a6c4f5fe72732ab308ebd648be8810be0b12fdc1ed9ba14da2f54141c21e5c

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