Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e8bb8eb1a97e3f…

MALICIOUS

PDF

83.4 KB Created: 2021-03-08 23:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02970b03218790a90532befba16ac6ed SHA-1: 1fe9087076c3fbd547892b3450967510a02ae92c SHA-256: 08e8bb8eb1a97e3fdd16ee7efa41048365ed0cfcb94053152a3038db935fb40c
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 functions as a link farm, containing numerous external URIs, with one prominent example being https://kuzutuzo.ru/wix?keyword=amoeba+sisters+dna+vs+rna+and+protein+synthesis+worksheet+answers. The PDF's structure and the presence of many links suggest it's designed to manipulate search engine results or direct users to potentially harmful content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=amoeba+sisters+dna+vs+rna+and+protein+synthesis+worksheet+answers PDF link annotation
    • http://unreguezff.rest/9377211335nk2l7.pdfIn PDF document text
    • http://fipoziwebetaz.22web.org/bizhub_c368_driver.pdfIn PDF document text
    • http://gisujug.mypressonline.com/simple_python_project_template_github.pdfIn PDF document text
    • http://navaram.online/58558317336a8wuo.pdfIn PDF document text
    • http://meetsucre.pro/the_devotion_of_suspect_x_2017wjem7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_f0b51532f1344a01b41e91c57e002233.pdf?index=trueIn PDF document text
    • http://ziwejozaz.epizy.com/rifisifow.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/youtube_to_avi_divx_converter_online_free.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_017ce2d624f144cd852ed96b27d90b7c.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_2346f5d58dc744ecbb3f443178801fe4.pdf?index=trueIn PDF document text
    • http://vovojoj.atwebpages.com/2501586759.pdfIn PDF document text
    • http://difugarulid.epizy.com/wuwinuzugepeju.pdfIn PDF document text
    • http://dobubijopawuxon.epizy.com/35470081294.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/why_do_keloids_form_on_nose_piercings.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_9235fc61f1404ef28ea83727e3610615.pdf?index=trueIn PDF document text
    • http://vajapojaperusu.myartsonline.com/36389824766.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_02c1b78351c1438399b4366cfe5413de.pdf?index=trueIn PDF document text
    • http://viwuwijagabote.myartsonline.com/what_is_a_valley_pool_table_worth.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_30862eecf1ce4a5bbd6cc7f8966d91c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/beamng_drive_free_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/vekogavenoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/reporter_meaning_in_bengali.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_5bcf9b3a5e714896937b12ba419338cc.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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 3540 bytes
SHA-256: 1f5437fe7ee3250473e06ddae249158d759430f8dc1efbcab4bceb9b9727bf82
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 5616 bytes
SHA-256: b4db2631dc07efb705a758510a149fdf332815276c44d9ebe38515995ab91c37
font_02_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10156 bytes
SHA-256: 444b42776494305ce44a4c6fedfd71415d44c22ab0bbc5aed95fce50722f1da3

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