Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ba022544db7d73…

MALICIOUS

PDF

84.3 KB Created: 2021-04-01 08:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 615c7f0682a1acfc8bfc40fe70bdb7ca SHA-1: afa45ae50062219f0dfaeca6278539c10d21049f SHA-256: 95ba022544db7d73f2b6ee6f3bddf084f7b0cc4ee71f2c0506384dab0b57e0ff
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Mh cet 2020 result pdf download' and 'wkhtmltopdf', suggesting a lure for potentially fake results or documents. The presence of many external PDF links, some benign and one malicious, indicates a link farm strategy to distribute or hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=mh+cet+2020+result+pdf+download In PDF document text
    • http://lifobamalelit.22web.org/being_there.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mexijegedakol/good_questions_to_ask_in_pre_marriage_counseling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea88e5b-78a5-4fda-8088-cbc2a4466046/4863960152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed343f7-e94c-41ec-ae79-5bbb3fa75648/wagirifirotatote.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/run_on_and_comma_splice_worksheet.pdfIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_d58e236a594f4555b946cbb4e5afb6ab.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_47fadb5ae61545bea56a3dfb319cdf77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df56cdbd-d7ac-4c71-955c-cdd291d9af23/what_does_it_mean_if_someone_is_burning_upper_back.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/mufagamomilibenibulow.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_8d2ef3c3b87d4b4f8dbcea6c4a656f49.pdf?index=trueIn PDF document text
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_e7b65135787b4fc3bd75cd88e1c5681e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/73486149691.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_9019c89ca01f44c6962e7f3331012974.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_3e0989c1147a45a6be77bc62c4d33efe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/john_deere_425_owners_manual.pdfIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_a0bfbbe118a84ccd81ea8be8c9625b98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/funilak.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_a8ca57fbb5b0494a94fc45d2e0e893f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3af22d-262a-4a81-971e-91c591250f9a/taviruzawupipufelu.pdfIn PDF document text
    • http://mamuwudusaxu.epizy.com/89181734389.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/bipenetiwuvadof.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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 5448 bytes
SHA-256: e5840f14131e46347e32aefee811e2c5f482edfff1a14caa5521e98a2deb5c41
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 11172 bytes
SHA-256: f0e26bd9175bd298b4b603328c4bc9c2bddd2be07527dbf22766897cd1c64790
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 16632 bytes
SHA-256: bfa32af85ed9733e9d329932c5444ef017f43cd1cf31216f18da05059aa2c43f
font_03_sfnt_off00013568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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