Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f77607fc55b07c…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 23:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6516550f3645dd75db247d89ce065cc3 SHA-1: 363304d20f43372c8e3a5bc5335fdc5f13a84ec1 SHA-256: 74f77607fc55b07c30c59f7fb046a0a749d8704efa5871303dbfc684ece7c2c3
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 0.9995

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://fokemale.ru/wix?keyword=solving+linear+equations+algebraically+worksheet PDF link annotation
    • https://cdn.sqhk.co/gederanew/Zm0tibH/jezotiwakolanekugovuke.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/h0iahfz/minecraft_exploration_mod_apk_v1._16._1._02.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/34384816903.pdfIn PDF document text
    • http://btsworld.org/digimon_rearise_gameplay_androidnlrma.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/2U5hgsM/48049401361.pdfIn PDF document text
    • http://mebelrostov.ru/metformina_850_mg_prezzodwn4o.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/hjiePhe/nekena.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://s3.amazonaws.com/nuselufuzo/bottom_navigation_view_in_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898ef22b-bdc9-4aeb-9212-6e7a2a9dd1d9/how_to_remove_iron_on_stabilizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4b0a20-cdfb-4c1e-b11b-bb73b8a4db8b/72864200342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b45db4-b843-401d-9c4f-102abf7cba9d/how_to_become_a_registered_nurse_in_spain.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_13262e78cb364e34b856a823d1c15080.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/fipovovudurexipurab.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_e285b503228446298706358b5e2edbf9.pdf?index=trueIn PDF document text
    • http://rekemulutudidu.epizy.com/circulatory_system_coloring_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/15807593936.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/sozesizupomuguludovepawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca04f07-1ac1-4913-94b3-bba9b47a5b38/83867781595.pdfIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_cd4777cd67f04de188be54551ecdec6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb84048-d6c3-42c5-b8ba-d97e250573d8/how_to_change_a_water_heating_element.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_3728ccf7522b489f9c5e29f0249c6fde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/mofixugofuva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 5632 bytes
SHA-256: 649ea80e9ea25893449f8cec580ee3177828722f35fe0f3934fb6662cfd4e10d
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10608 bytes
SHA-256: 6b9a74f089f6be454eaa5d1e3aa9d502ef0c562fd4042036879e00833e29f9f2
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e