Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e06ac9baf059af…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 06:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f96f8a7a5f201fd6efbab1b80bbf38cb SHA-1: 593e2145b4a008a91fc2bb210c07c9300c100236 SHA-256: 84e06ac9baf059afe7dc3b47799753168e0e35192fc80ddbbbef0dd02a23bf8f
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to domains flagged as disposable or unknown. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or redirect users to malicious content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or redirection attack vector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jottigo.ru/strik?utm_term=m-audio+fast+track+usb+driver+for+mac+os+x PDF link annotation
    • http://profapp.pro/luraxozakazoto2gena.pdfIn PDF document text
    • http://govnosiakxws.online/cowboy_bebop_netflix_cast_ed1wa2e.pdfIn PDF document text
    • https://cdn.sqhk.co/balapakufogo/cHJjgjf/smith_s_deli_hours_of_operation.pdfIn PDF document text
    • http://kefets.xyz/website_to_machxtas.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/dajigi.pdfIn PDF document text
    • http://autolombardpro.ru/the_myth_of_sisyphus_quotesmtxqs.pdfIn PDF document text
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/0981c013.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/tejaravape_lepokotusowim.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/xuQdNgi/tunasenikidirok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_bb416457bb4a40a493b5df0c6171fbea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/833c30b8-92be-4051-864f-ea1ed88342c0/gepajurewewap.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_ec0f75eb197045cda7eaea85aacdc808.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/38972650166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe6db20-1e19-44b5-bc0f-92d915a8ba86/maselakidaligezovuboboxum.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/it_s_a_girl_card_template.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_e6f75219b67e429397f0a7d8099d698f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/48713788214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c632bd9-9a87-49e9-8f32-bc1b64a84f2c/sharper_image_candy_dispenser_owners_manual.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_bc5487709f674993b66769f0dd666577.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 5504 bytes
SHA-256: f4a6087c6284882c8740e96dcfb91553b0a60ef0ee5608ad109cb184470121f6
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 10888 bytes
SHA-256: ee8aba552271e412fafc5885379c38b24a1c5fbf5e587fd6277f9d26cbe0ec2e

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