Malicious PDF — malware analysis report

Static analysis result for SHA-256 9758377bca4c0ff3…

MALICIOUS

PDF

83.7 KB Created: 2021-06-04 08:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 364fa9eef40649459f7431fe4edde840 SHA-1: 559887481ed637404cc91d15e1263b47be2fa9eb SHA-256: 9758377bca4c0ff3a3cd40a7367e2dd027437593d382c36a921dc79f495f5c32
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that leads to a domain associated with phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=identifying+and+representing+functions+worksheet+answers
    • https://xebolusuzibukun.weebly.com/uploads/1/3/4/5/134506512/pawosonasawufoze.pdf
    • https://cdn-cms.f-static.net/uploads/4465694/normal_603020af934cb.pdf
    • https://static.s123-cdn-static-d.com/uploads/4458421/normal_60afe8a6aa684.pdf
    • https://cdn-cms.f-static.net/uploads/4466676/normal_605c607c61c18.pdf
    • https://woralolur.weebly.com/uploads/1/3/4/3/134359953/6baa341d6099.pdf
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/5275321.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://godekazonigi.pbworks.com/w/file/fetch/144459027/40887504662.pdf
    • http://kivupored.pbworks.com/w/file/fetch/144485670/midupevexan.pdf
    • http://tekitejug.pbworks.com/f/auctioneers_act_cap_227_tanzania.pdf
    • https://uploads.strikinglycdn.com/files/9fb298bc-e2df-434a-8f81-5fe44c7162c0/the_ways_we_lie_stephanie_ericsson_thesis.pdf
    • https://uploads.strikinglycdn.com/files/dd6d088c-8dd1-40bc-9465-c2cfb8824d9d/how_do_you_light_a_magic_chef_rv_oven.pdf
    • http://molitutolu.pbworks.com/w/file/fetch/144536592/puvewafepa.pdf
    • http://sipibujewadu.pbworks.com/w/file/fetch/144484086/hello_neighbor_alpha_4_trainer_download.pdf
    • http://rugewenuzed.pbworks.com/f/dc_comics_encyclopedia_new_edition_2021.pdf
    • https://uploads.strikinglycdn.com/files/ebc335fc-19b0-4b0b-876b-89b022bb70c4/99433382269.pdf
    • http://finebov.pbworks.com/w/file/fetch/144440853/29584315551.pdf
    • http://jebusolole.pbworks.com/f/exercice_franais_figure_de_style_3eme.pdf
    • https://uploads.strikinglycdn.com/files/c229fdeb-e461-4d77-9eb7-918140c91be7/the_princess_and_the_pea_story_read_online.pdf
    • http://jebusolole.pbworks.com/w/file/fetch/144490314/23717847837.pdf
    • http://nebapelamive.pbworks.com/f/whats_a_quotation_sandwich.pdf
    • https://uploads.strikinglycdn.com/files/f8492c26-088e-4379-ae2e-a0e06937c25e/34282555062.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec79.bin
28d34d7ef9d5e91b670d6eb2a402ed081cd332bf731217c56bab5c78e56b8be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5580 bytes
font_01_sfnt_off0000ff96.bin
6802644e26ffa8a04377b567894f7543aa4870e35279c1a730cf7f4a5a46bb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 13372 bytes
font_02_sfnt_off00012b44.bin
8a61b859cb48289fd03cdd8d9300ef032145bdf72d2c2c1eaead36a3c643c998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16232 bytes

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