Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4199a6b343ed03…

MALICIOUS

PDF

80.0 KB Created: 2021-03-04 13:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 77db37a0c824f7f59593fc649dc18e5a SHA-1: df0f2962f8279420970f9963be581508d1406aa5 SHA-256: 0f4199a6b343ed034a02991d6a0cfbeab9e0d76aacdb435af07f31b0358f8f34
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam campaign. One prominent URL, 'https://zajinet.ru/award?keyword=tres+metros+sobre+el+cielo+pelicula+completa+hd+gratis', is presented as a search result for a movie, likely to attract clicks. The ML classifier strongly indicated maliciousness, and the PDF structure with mass external links aligns with malicious distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://zajinet.ru/award?keyword=tres+metros+sobre+el+cielo+pelicula+completa+hd+gratis PDF link annotation
    • https://fufiganegobugu.weebly.com/uploads/1/3/4/4/134496384/7711f103a.pdfIn PDF document text
    • https://kotirilu.weebly.com/uploads/1/3/4/3/134332744/ruseg.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/bdd742d61718bd.pdfIn PDF document text
    • http://zuwaweno.iblogger.org/5377265506.pdfIn PDF document text
    • http://vijoxufomodazug.22web.org/hays_uk_salary_guide.pdfIn PDF document text
    • https://ponukikoruxa.weebly.com/uploads/1/3/4/3/134343798/c8180be6.pdfIn PDF document text
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/4707e9d2b506.pdfIn PDF document text
    • https://nusufonofa.weebly.com/uploads/1/3/5/3/135341523/963c601a4d5371.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/f0ebfa5fb851f.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://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_2f08ee2c119942558f2955b223411fcb.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_66d65b7ad0854745888c97fcc3701e0f.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_bfeb67c3331e4fab944edd0d4b95da76.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_22afcad8ceb0417f80bfd48f988b11ec.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_300697ef348646fa9678c2fcc3692255.pdf?index=trueIn PDF document text
    • http://vebaxabono.epizy.com/happiness_definition_answers.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_2a1f66b92aee48dd964be320f9c555ab.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_bb2813ee8ae64254a13cd2dbf38d3f89.pdf?index=trueIn PDF document text
    • http://vilewol.epizy.com/how_do_you_get_netflix_on_dish_hopper.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_3ab99daf8e7942658019d859d0130bf1.pdf?index=trueIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_2bd22a0ce6ee48c0aa61b7c05eeb8ddc.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_1ce1d61b4fa04cd2ba3ff8deaf321748.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_7328fc223f0144ed9c72a47916809cf0.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_07fce0b3113f4f37b0a419175c5ef267.pdf?index=trueIn PDF document text
    • http://baxudamotis.rf.gd/wosafajivul.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_6b3a22e8f464493fb61ebb27a5864809.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_0bdb8e190e124a268db1a2e815ea912f.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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 5352 bytes
SHA-256: f3bad56010e075e03faa22bb3dfc18925d5699380a1a4ac9c740ba794a41bed4
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 11708 bytes
SHA-256: 5e353d8050ab3c98ffa860aecb24b7e615e378d2f0897c34342c8d2bcb16fe74
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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