Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1872a7e78e300f…

MALICIOUS

PDF

104.1 KB Created: 2021-03-15 22:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 392b726e089458fde43cfcaa0b4dc248 SHA-1: 8233ffdf47911baa553417ad7ac4da486cd05c24 SHA-256: dd1872a7e78e300f4b85484655201c5de4ef845b5b1020ae5e26b60a192f483c
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious or spam content, potentially using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://gimoguvi.ru/strik?utm_term=el+coran+en+espa%25C3%25B1ol+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5fc9479b95acf.pdfIn PDF document text
    • http://rubeatyshop.xyz/557309700850s59x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_600272452ef9f.pdfIn PDF document text
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/nofogolu_titejefiver.pdfIn PDF document text
    • https://namovanuzo.weebly.com/uploads/1/3/1/6/131606642/62ffb9f682.pdfIn PDF document text
    • http://wafowufopenu.22web.org/stephen_hawking_film_actress.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/24543563737.pdfIn PDF document text
    • http://zuluguvo.iblogger.org/safatosafoxejol.pdfIn PDF document text
    • http://katorewudejizut.22web.org/vonivos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_602e0ebfcbeae.pdfIn PDF document text
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/5443630.pdfIn PDF document text
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/9386453.pdfIn PDF document text
    • https://fuwefojogimoro.weebly.com/uploads/1/3/4/3/134339806/8177957.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/irobot_roomba_i4_4150_vs_67565elo.pdfIn PDF document text
    • http://manovina.mypressonline.com/protocol_helicopter_remote_control.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/zivamitojefokoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_2e9854e68e8d44bba918c6b3e5052eef.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_6984c99840e8431dbbaac89fd4203087.pdf?index=trueIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/14033043774.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_5419daf0b52d4272a73a6c2517dcc05d.pdf?index=trueIn PDF document text
    • http://nasukenapab.epizy.com/54227711727.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_189e80876f8747eca4a2fb4d3fa815a6.pdf?index=trueIn PDF document text
    • http://vosivoru.epizy.com/hink_pinks_level_c_answers.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_b69ed142d4004d0dae96282989abe0c1.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015b2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B2F 21316 bytes
SHA-256: 226c659f25c1ebc21f73b400e809f6d055fc8b2de4b81dbd6e187635a65f136f
font_00_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 3656 bytes
SHA-256: 4a927e415f9bf12d99ec87034ce32a8ec3e7a19f0e81f236d1763c4f39729093
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 5492 bytes
SHA-256: 34f2d628a79a9bc42d76cd56574b6d0da1073ae5b915c23e2133a1c18fa58c4a
font_02_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 8048 bytes
SHA-256: 9dbbbfefe182292fec8eda38b207dd8f0ad5b42f71df4734285dddbd9dc9f7df
font_03_sfnt_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 15020 bytes
SHA-256: 63a60d236d394ec3d95b968a69ed4471c5e5665dfad1f75c724a7e100716e76b
font_05_sfnt_off00017edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EDD 4532 bytes
SHA-256: d915948350122ca79ea1351574f829233ad363812b61d25944a960b2208c07cf

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