Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dcc9f7f44d2e16…

MALICIOUS

PDF

96.7 KB Created: 2021-05-28 06:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a90f0af71e4d642919a19436faf5ed6e SHA-1: 918ef6577f697562012883d6756691f9dd7094d7 SHA-256: b0dcc9f7f44d2e16f7abe12164ab34a7f5787c6cb6dd628c1deedd7ca4961111
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to phishing or malware hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=how+long+to+do+brandt+daroff+exercises
    • https://cdn-cms.f-static.net/uploads/4414176/normal_605304bb77a8d.pdf
    • https://sozefusezat.weebly.com/uploads/1/3/4/8/134860931/legoxisejipabaj.pdf
    • https://cdn-cms.f-static.net/uploads/4393209/normal_6041fafa49080.pdf
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fc7bca0c145e.pdf
    • https://wazumiwu.weebly.com/uploads/1/3/6/0/136038811/9827694.pdf
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/5949039.pdf
    • https://womijepadake.weebly.com/uploads/1/3/4/4/134476187/4423909.pdf
    • https://cdn-cms.f-static.net/uploads/4475215/normal_5fd114d2eb90e.pdf
    • https://cdn-cms.f-static.net/uploads/4454168/normal_60147f87c46e2.pdf
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/rojisezokezake_morabofijegiku_ligawikirojumas_tufow.pdf
    • https://cdn-cms.f-static.net/uploads/4475989/normal_60298ce17dd5c.pdf
    • https://cdn-cms.f-static.net/uploads/4444117/normal_603e59b32107a.pdf
    • https://cdn-cms.f-static.net/uploads/4365541/normal_605b26a8471bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/646907cd-fee6-497b-b749-ca639440de0b/cuales_son_los_signos_de_puntuacion_entonacion.pdf
    • https://uploads.strikinglycdn.com/files/b7130554-ce6a-427f-a476-5c6880b9f0ae/sat_subject_test_chemistry_curve.pdf
    • https://uploads.strikinglycdn.com/files/19a1def0-3960-4235-a11f-b5e88de39857/how_to_write_a_novel_from_start_to_finish.pdf
    • https://uploads.strikinglycdn.com/files/a42c3809-258b-4992-8778-7fae3d31e127/83831953139.pdf
    • https://uploads.strikinglycdn.com/files/9748337d-8141-4763-a440-5860c398b9c9/29301102355.pdf
    • https://uploads.strikinglycdn.com/files/954931e0-cd53-4612-8799-3d2d163e5925/81744795946.pdf
    • https://uploads.strikinglycdn.com/files/bb96d547-03da-4498-917b-d9c0ec1c1ad4/rusejepasu.pdf
    • https://uploads.strikinglycdn.com/files/1fdbee7b-2385-4382-8b7e-5544ef927156/enduring_power_of_attorney_uk_example.pdf
    • https://uploads.strikinglycdn.com/files/fe0615f7-e028-4ebe-8bbb-bbfff115e9d1/kasabifituxukufatizi.pdf
    • https://uploads.strikinglycdn.com/files/dcd12b33-68d2-4d6f-99cc-87a0a4378276/1619202234.pdf
    • https://uploads.strikinglycdn.com/files/02293075-f51a-4f01-b7eb-e1fd1aad0356/zisegokogareruzefu.pdf
    • https://uploads.strikinglycdn.com/files/c9d2cfa9-3cee-46db-af6b-d792077fd886/54315052024.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d71.bin
53c69da4010bbfe3df2cc355cf5b80649ae31447c82681bdf72e2a7ddf5ffd28
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D71 5448 bytes
font_01_sfnt_off00015021.bin
facca8976168355e7af991add399dee98984c6edacf7c3fe3fbce6dbe2c87128
pdf-font-stream PDF embedded font (sfnt) at offset 0x15021 10928 bytes