Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e876688e426fd3…

MALICIOUS

PDF

80.9 KB Created: 2021-03-18 01:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a15c6feb4b7e5a6358f6ab93fd92d552 SHA-1: ee9fdfa08f08e22b573fee487985f836d4900df1 SHA-256: 77e876688e426fd3bf5ca34038fb9c77108268e6c8af9dbb7a724985fa206244
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric slugs pointing to PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ponafet.ru/strik?utm_term=how+much+does+a+ruud+furnace+cost
    • http://dusamoka.mywebcommunity.org/54372783850.pdf
    • http://pinegobojefo.getenjoyment.net/how_to_read_tarot_cards_together.pdf
    • https://static.s123-cdn-static.com/uploads/4391308/normal_5ff968c94f258.pdf
    • http://lunagogafoxoj.sportsontheweb.net/reziwujuwipusezomamoj.pdf
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe16b6ead9d4.pdf
    • http://wegoluxetas.scienceontheweb.net/61607443180.pdf
    • https://cdn-cms.f-static.net/uploads/4366620/normal_604101021ae2c.pdf
    • https://cdn-cms.f-static.net/uploads/4421365/normal_604d74a3b6b61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_2915812f5a5d415d98b6357e956ae376.pdf?index=true
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_842329fd76ba4e89b83860afc827306a.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_fd26485a17f046e3abad63e22855b5a2.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_7c817526bf8543f682d5aa5694ee4a2a.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_a29a9b38e85e418b8c94015a2aaf1e5b.pdf?index=true
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_fd7a4cd20f624fbea0991d3146ca4859.pdf?index=true
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_3351f50fefef4355b4657a15bf6a1ce6.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_6862f60598ab44f985af1682bf9c9345.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_5197a713edc4424d93ea0d8f4eaf6245.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_7b59ec7ba8274746a694dfa411f4ed5c.pdf?index=true
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_c936667f42404cae8dd3ba31349d2455.pdf?index=true
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_8f548d571e2a40328c85a4142f1ea3ec.pdf?index=true
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_1cc4ce0c68b049d599540f79d92f892e.pdf?index=true
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_8ccddd6f73154f85a272753407411d2b.pdf?index=true
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_af65739a6e8c443497bf3f383aee924d.pdf?index=true
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_e4eb06b968064ec8a423ec299ff18083.pdf?index=true
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_d5b8e547532845fb8325b4c8225a824d.pdf?index=true
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_7dfb9641da0c4d819b669d42e345327c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe01.bin
0112c84f1cc7ddd71072db9df013db831bbd8dfee9e1a9f112d333038942fd77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 5280 bytes
font_01_sfnt_off00010fda.bin
a03330b40f56426dc442cf8832d3ba0480c9c9ebdc61ad7fa38b6b42ae18396c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 10732 bytes

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