Malicious PDF — malware analysis report

Static analysis result for SHA-256 638af1e7ba0107de…

MALICIOUS

PDF

82.7 KB Created: 2021-03-29 19:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74de642d76e6e803012ee38744bd7fd0 SHA-1: bca487e2c21c42108eadfe2bc910450db0da1161 SHA-256: 638af1e7ba0107de6c9d2232f549cac6c0c1825625067e4c015ae48125e69b5e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with a primary malicious URL pointing to jumiwimov.ru. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://jumiwimov.ru/123?utm_term=discrete+wavelet+transform+python+image PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5ff899eab77ed.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/vatupipejalo_dagubo.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/06ec6ff4284e7a.pdfIn PDF document text
    • https://nupanirosum.weebly.com/uploads/1/3/4/8/134858368/8787295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_6011714b0f81e.pdfIn PDF document text
    • http://wibofot.22web.org/42958225858.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/7637981.pdfIn PDF document text
    • http://zepofevof.22web.org/rudonegodidoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_605315fe84ba4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fe92f9-0bcb-41cd-bb17-66aa31e2bb9c/11091591140.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_0125ccc033e04cf9ad33cf314cb96eb7.pdf?index=trueIn PDF document text
    • http://xumeweb.rf.gd/98905238457.pdfIn PDF document text
    • http://wikimenuvebiz.epizy.com/novewenuzarirew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0762f9a9-0d9a-4f77-a9ec-f76d6dc89c5e/the_birds_papaya_hate_account.pdfIn PDF document text
    • http://buvanudune.rf.gd/cg_jung_collected_works.pdfIn PDF document text
    • http://sirovorisolilu.rf.gd/periampullary_tumors.pdfIn PDF document text
    • http://gegukisakewomo.rf.gd/pofalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f6dfc2-779c-4baa-9ca4-4aa6d57a81a9/echo_dot_2nd_gen_not_resetting.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_af011e2f9756447b86fb48b380c429ad.pdf?index=trueIn PDF document text
    • http://gavojomizam.epizy.com/77504007469.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/83772588426.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_46838e0855a945428148461638ec1b03.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_d4b345104d4d414eba30efaf112079b8.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_418abcba8a8e49f3836ff0147f2324f5.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5680 bytes
SHA-256: 0122f5e31bdd18f9bafc4aa2132e1dae8e24d35926650370249b4d08c4a41d60
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 11668 bytes
SHA-256: a53d06c4492bbbc34e9f9f2fcfc80d9607c8897cb2f5c82690e16e5c4a0f0b11
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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