Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ae0bf864821b1d…

MALICIOUS

PDF

86.5 KB Created: 2021-03-27 17:25:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfd4bd9b15be9cad5cb079a5e75c6bd3 SHA-1: 2feba2f9f62290d9005f5078f7bfb9853661b4af SHA-256: 77ae0bf864821b1dcef834581c29e8e730c3c68258d932060aa90b1b07be46d3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, pointing to a potential link farm or a method to distribute further malicious content. The primary URL identified, 'https://golowaki.ru/award?keyword=antibioticos+pdf+farmacologia', is suspicious and likely part of this scheme. No scripts were extracted, but the structure and heuristics point towards a document designed to redirect users to other resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-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://golowaki.ru/award?keyword=antibioticos+pdf+farmacologia
    • http://milofaguwok.iblogger.org/53413973821.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73404220-fbfd-4526-a3ce-5e9a0bb45619/how_to_set_tax_rate_on_casio_ms-8tv.pdf
    • http://xujiwusa.epizy.com/62149241753.pdf
    • https://s3.amazonaws.com/ziwuvijevo/zenekar.pdf
    • https://uploads.strikinglycdn.com/files/02e2d262-5821-4e57-8c45-923ff5d51ea1/66328937907.pdf
    • https://uploads.strikinglycdn.com/files/b29aa1b5-0e9c-4b33-9d8b-b4929debec6e/rilarulapika.pdf
    • https://uploads.strikinglycdn.com/files/3bf07dc2-9bea-4e05-a668-b32b41d9119f/687150086.pdf
    • https://s3.amazonaws.com/kewakuko/97832672377.pdf
    • https://uploads.strikinglycdn.com/files/f82ffd2b-e8a2-4bc3-966d-bb8c133149dd/wuludopidesetaxarage.pdf
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_fb3179bf533b4564b76a368ea5984418.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d3dae8a4-e2ad-4cdb-9d4e-81cc24a242a3/prayers_that_rout_out_demons_audio.pdf
    • https://uploads.strikinglycdn.com/files/c2a622fa-91d0-485f-8198-da48a1b14774/serato_dj_software_for_mac_10.6.8_free_download.pdf
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_6deb7fe46dfc49ebb211abb035dc0b87.pdf?index=true
    • http://pamakejexo.epizy.com/4364474921.pdf
    • http://wosumobikufiw.rf.gd/windows_10_32_bit_professional_iso.pdf
    • https://uploads.strikinglycdn.com/files/8352ab6c-02f8-47b4-b544-24a0d3f6e4f3/bruce_lee_jeet_kune_do_bruce_lees_commentaries_on_the_martial_way.pdf
    • http://megisaduvivegi.epizy.com/xudutuba.pdf
    • http://patuwab.epizy.com/what_causes_a_bloodshot_eyeball.pdf
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_32eb036e356f41eb984cc229051eaa97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e0501f3-700c-46e4-aff8-178f83ae966d/zejubugefefesadizopa.pdf
    • https://uploads.strikinglycdn.com/files/702dfcae-5f98-4885-b026-3774905a04fd/91046960096.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f7.bin
e27cc9a8d04cb620ef950779d9305f4042c5dbff62305bf30ec4aa2dff010b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 2064 bytes
font_01_sfnt_off00010e44.bin
ec6802e0a895a9a12c2a38ab2bf240a6e02ee76bee7f627f16e506698a45307d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 5604 bytes
font_02_sfnt_off0001213b.bin
aa43b6a17089479fc233167ddaaaa70003d7a3f1aee674edbf832dce434d87d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 12700 bytes

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