Malicious PDF — malware analysis report

Static analysis result for SHA-256 9455afcb99deaaaa…

MALICIOUS

PDF

82.9 KB Created: 2021-04-05 11:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 548923e89a39185e166d07d26b1b1066 SHA-1: ce1020c95d864d4fe8dd6bdc361b4f730142c52b SHA-256: 9455afcb99deaaaa3e7d5bb300b0f3ec7b68950cd3c2ec6211a0123e97154e3a
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, characteristic of a link farm. The document body, though heavily obfuscated, contains text related to setting an Armitron watch, likely a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its role as a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+set+armitron+digital+watch+wr165 PDF link annotation
    • https://cdn.sqhk.co/zuvutose/TgcJRGD/17027657279.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/FMxENhj/welemor.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/hga44jg/dragonvale_aura_dragons_list.pdfIn PDF document text
    • http://fisidijomufuto.22web.org/toeic_answer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gjcjfja/mijofuder.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/2MNghPn/horror_vr_games.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/ghJ0geB/add_emoji_to_text_generator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc6ebee-28c8-468b-9a51-cf65a0fedef3/20977475551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8b633b-05d9-4e0a-82f5-79fca1fc8e82/carefree_rv_awning_fabric_replacement_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a465e72e-5ecb-4e47-bcb3-b73952b353f4/what_is_the_role_of_social_studies_in_nation_building.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff00a31f-3e71-426b-85c9-dd5206929c2c/96499765653.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_2495e58669dc43bca32ac8df02a7ccb1.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_a0adecd239a74cbaa51096f4eb50bce9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c601451-a79e-4666-a15f-c54400bab311/nafileluwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8ffc07-d364-4a5f-bdf9-87d98b8b031b/vatogesesose.pdfIn PDF document text
    • http://danitezuzaja.epizy.com/28610296627.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_7adf0fe4bf44474ab4c8f9dd80ed3c67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dfa573f-7d89-421a-97c3-d1ad0e1fdd10/nowofuziweta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af853ff7-881c-4d23-a28e-09ecd486d2e5/19083025164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a4e0e3-b804-44a9-a975-431e974a22c0/how_to_treat_pimple_scars_at_home.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_931a9504caf1419b993a7e92d900e3f0.pdf?index=trueIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_d71e06d0eb3a459c911be0e1b35781bd.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_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 5736 bytes
SHA-256: 80c6c6458cb84c126abedd9ec758aaf0ce27b3ec828e679422616b8ac8af24f7
font_01_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 10800 bytes
SHA-256: 474f44a0f73041dd93780a084ed2242e2650d68103ffd487ba20954143fd3566