Malicious PDF — malware analysis report

Static analysis result for SHA-256 875c4c33f9adbf55…

MALICIOUS

PDF

60.6 KB Created: 2020-10-15 16:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cde92cb823b875dfb9ae29e2b2ac51a7 SHA-1: 94a3a1cc0c0826f0e80589f7fc26d4068fdfbac2 SHA-256: 875c4c33f9adbf559fcbd4166e62c59952e0989dd035a98f156e9148a42ce418
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body text, though partially garbled, includes a URL that appears to be a lure for 'khutbah jumat 2020 pdf'. The ML classifier and heuristic firings strongly indicate malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://cctraff.ru/123?keyword=khutbah+jumat+2020+pdf In PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/zaramevasitu_zexazivofulovap_tuper.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/9594994.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f872aa88f5f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f87526bd5655.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/d952cee3-d069-4161-bb09-2c1e7b42c48f/rutezedipefote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ac6971-4910-4034-9595-3dafd87dbf70/jigexewaxigav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44376775-e16e-4ce5-91c4-1907cf5dfe6f/duveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a2617a-5e02-457e-bd75-e7b66c8bc582/79627157200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317f2f24-7e1d-4749-bb26-1a253436d5ee/33686467876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5555/3951/files/handbook_of_organic_solvent_properties.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0920/2597/files/peviramaxumewasewiza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2664/7709/files/96499314487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8647/8489/files/animal_crossing_new_leaf_starting_character_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4953fa-9580-4aa6-b8be-ae999b240286/jiluwole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225d5518-3528-4e0a-9b39-866904e348e4/darukirireluzajiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716c836c-fb1a-4102-9084-7db35c70f4a6/36717620605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4498aa55-6226-49d9-b63b-97e3c9540118/89152606213.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ad0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD0B 29848 bytes
SHA-256: 64ffb2490fe233e7bf80b5fe275ec9dc00b73c26e3d8b7d5bc50b7f90a8b1246
font_00_sfnt_off00007993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7993 5436 bytes
SHA-256: ba8eee1e9d366dcbb9c6267f71c10c89e1ece77b1211eeac8923415f8f50e7a3
font_01_sfnt_off00008bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFE 10304 bytes
SHA-256: 1284e8c93dbce8472486dd4e6ff933034d243fc20054f9469f0c6c7eeb1a13fc

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