Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4bfc4bd55d2648…

MALICIOUS

PDF

83.5 KB Created: 2021-06-13 01:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 800461edff66df3f1f0a6ebfd1d08abf SHA-1: d557c117bed577afb0313b0707b384ecac6700f6 SHA-256: 2c4bfc4bd55d2648f13630066eeaf235f9299efb055d074043de51de5b8d2470
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/pbw?utm_term=watch+humpty+sharma+ki+dulhania+online+free PDF link annotation
    • https://menedufigejit.weebly.com/uploads/1/3/1/4/131482930/7755656.pdfIn PDF document text
    • https://zexaloguf.weebly.com/uploads/1/3/4/5/134576330/bakibax_nutiferowu_mimenumanamevox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_601450784b2fa.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/jamabo_reniz_fisawanizetafij.pdfIn PDF document text
    • https://regumalewa.weebly.com/uploads/1/3/4/6/134694163/muximidovevedoduworu.pdfIn PDF document text
    • https://nutevozugunejeb.weebly.com/uploads/1/3/1/4/131483143/1874cd33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fd2030a97e80.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://uploads.strikinglycdn.com/files/46a53b13-3d95-4bd7-b259-1d45fa0afa0a/2020_lexus_rx_350_f_sport_interior_colors.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/145172940/13876204534.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/tadifiwezedag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a97ed7a-773d-442f-b47f-712b43729111/poetry_books_free_download.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/fukalofapadowogajoku.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/145212060/kinds_of_clauses_worksheet_answers_lesson_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67f17a7-88a3-4c6b-a5a4-77ae9a660808/17218381395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e0d320-93c9-4c98-a72e-61bd2cc99ecc/vishnu_sahasranama_names_in_tamil.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/nusozodifulekanifaloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1323c3cd-d9ec-4526-827f-b1ccd0ca7e70/94421276982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc0e1cf-162e-482e-8bbd-b3e8e4dcf213/86530759399.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/144426513/84776467845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e29a094-560f-41e3-a6bc-c994c7f3222f/86301533190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce03ea2c-f403-40f0-9f12-97806cc02524/how_to_calculate_active_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a32b1f-c54e-49a2-828f-160eb1aff3f2/how_to_talk_on_baofeng_uv-5r.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 5576 bytes
SHA-256: 573f79e556e627a05c1da2d5905d38de4d13118d14eed64eb52cf7e54b61a183
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 10900 bytes
SHA-256: 91c8abd74a8a185ea8d75905f2cfe4aceb33b9deb57bb5d2e6ea10f0b91bed78
font_02_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349
font_03_sfnt_off00012f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F46 4264 bytes
SHA-256: 454d0ed85aa08434f20f31915885b29064310e0ccd4d884add953449270847ec