Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c11edf4b576290…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 19:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f5467ea7e80f3e7dfc8ec4f65334e925 SHA-1: 2ccaa8ee39631de48923b7104453a3b448d4dba3 SHA-256: 86c11edf4b576290f2c8be815e2d9abedcd5feafd727de10e32ea40a64db0227
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=photosynthesis+flow+chart+worksheet+answers PDF link annotation
    • http://gooddevice-online.com/neratigavezafuwibujofveihf.pdfIn PDF document text
    • http://mavito.online/llama_380_gabilondo_y_cia.vitoriaeijxd.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/4059853.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/9f2321e2dedb95.pdfIn PDF document text
    • https://nitogumijuta.weebly.com/uploads/1/3/4/8/134876923/52871b.pdfIn PDF document text
    • http://avlto.best/80881437301l2zk1.pdfIn PDF document text
    • http://trastenmyqort.online/bidajopoxezaluwovomogud70od.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zurovajij/26238586950.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/80572143653.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_2c4b828d6c9c4dbf89580fe872c98c95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91595197-6ae4-4267-b48b-ec19f5fb45e3/bushnell_elite_binocular_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f0cea1-9c3f-4936-bba6-92c14ebc32a7/xulebaditapiparen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c81bc9-6842-47e4-8d91-0f25fe4d6ddd/wendys_strawberry_salad_2020_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a72f12-1797-40ca-9851-8c6dd6dd87f8/unidades_de_medida_de_temperatura_y_sus_equivalencias.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/nulosoxumenawixum.pdfIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_f47f8aae7a9345c7a0daf2a1a5e0812e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6370799a-f734-4cbb-a377-e2045f5f580c/my_cloud_library_app_is_not_working.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_268bae74c6c148fbbc79cf435dbfdeb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/cuddl_duds_cat_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695dfdc8-600e-45c4-a54b-04c40822736c/4_types_of_informational_text_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b1f2f7-75f9-4aa4-8247-07c56963d1e3/star_trek_movies_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e2a780-e47f-4103-899d-7aa50fd1a439/salinolax.pdfIn 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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5228 bytes
SHA-256: f7644e910f86b9c78cfe6a77cbe5197e93cde5c57041fca874108f2e08b9fb9d
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 10520 bytes
SHA-256: a1971974f807553707be1ef776d9a42bbef1d2461157ef123c99475848df3ab0