Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7da4944b221b1d…

MALICIOUS

PDF

86.1 KB Created: 2021-04-06 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d970426479144e6b0702f08cee3e78c2 SHA-1: 23291c0218f4b39c362f4c983c5b069257ae8bac SHA-256: 9c7da4944b221b1d89e80b380459c78a6cf524b6d83a8b4a68041b882bc35d4e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=bluetooth+keyboard+for+android PDF link annotation
    • https://xorizugabe.weebly.com/uploads/1/3/1/3/131398100/webowebupevowe-mejasinakejif.pdfIn PDF document text
    • http://bukuvud.22web.org/tifuneribazedonitevixa.pdfIn PDF document text
    • http://tajulixejeri.iblogger.org/biolase_epic_x.pdfIn PDF document text
    • http://lokunuba.iblogger.org/life_and_death_free_download.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/zesebuxeri_nurerozene.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/vezetuwo.pdfIn PDF document text
    • http://vujumitadasedi.22web.org/muscatine_county_sheriff_accident_reports.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://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_e3f9fd477a2044ed861bf755ea304584.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_86effdbb59f948b1b2b93a5e5d806970.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_7da10e1227a04151aeff4fba7936956d.pdf?index=trueIn PDF document text
    • http://wujawejibizub.epizy.com/adobe_premiere_pro_templates_free.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_0e80cbce1b204ff2be9f323ad2625c54.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_595de67bc57a48079020f471fd59afc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/39319191275.pdfIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_f7eb7020e5a54a199ea6b164389701a3.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_8781e21c033748bbb3c82b8f5d8a9957.pdf?index=trueIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_edadceb033ee492aaf16a9df0da2477d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/scratch_free_for_windows_10.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_4c46501257d34c08b4512b77424eab56.pdf?index=trueIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_1b8f80ac01274770bfe99dc04c1ea36c.pdf?index=trueIn PDF document text
    • https://298c7861-702e-4dad-8e6b-798164301c36.filesusr.com/ugd/98adb1_f6d54af4c20148fbb5113b1e05d03330.pdf?index=trueIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_b92e75abfe0949a9bccfd6876e511dfd.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_1cec2dddcf304ddda47437f181ef04e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavale/cutover_migration_exchange_2007_to_office_365_steps.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/57910186552.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_a65a6041379c4e70883ca3ebce76d1c0.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 5056 bytes
SHA-256: 1627fd8c4754f3ededa9e9da4dd4e7d6e437da9b086190b711f5056fe4784926
font_01_sfnt_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 11136 bytes
SHA-256: 923b4b8c187be1fecd4aa3db49056fde3f022d10a7123282453f9cbf309eef25
font_02_sfnt_off00013c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C34 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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