Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f2c3da282a54dc…

MALICIOUS

PDF

75.8 KB Created: 2021-03-12 18:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6080c4f64bb736bc6f0750c5e2877bf SHA-1: 291d96227e880bf0871e206381072f5d1c4588f7 SHA-256: f3f2c3da282a54dcbde1c58f638e8ddcc7accc8e348146e2c8ebe7aa65a65198
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=honeywell+home+security+system+manual PDF link annotation
    • http://rowomonug.mywebcommunity.org/sufilu.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/10d87e50013.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/la_nueva_biblia_latinoamericana_de_hoy_es_catolica.pdfIn PDF document text
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/1146925.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/8280410.pdfIn PDF document text
    • https://fonuwinozizanam.weebly.com/uploads/1/3/1/4/131408397/dekiwewizaga_bogodudeja_wiguxegukotifir_velediruw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_e96d890c27c74d038a440de9dfbc9347.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/199618dc-222a-43fe-a342-dd0547ffcbb7/de_que_se_trata_la_obra_la_iliada.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_a51b83f975554013b100bc6ef3c0f420.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/298688f1-e810-415a-808f-da152a6db5d7/the_norton_shakespeare_3rd_edition_digital.pdfIn PDF document text
    • https://0a9dc515-c6d9-419f-b4de-d801a8c2a39b.filesusr.com/ugd/760a4c_de2170ae8c5a425dabcfe7537f62cf09.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_df23d6951df74baaa4438e5a6b081f40.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_d4c60550ba304f919476de22d32d3c24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/097a1ee3-316e-452d-a314-0f0ba18a0428/how_to_find_the_velocity_of_a_ball_when_it_hits_the_ground_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a49c60-6ad1-49c7-a549-c062efc83084/mivakemekojenisaput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3bbcd9-20ce-46a4-9283-3159e12d5020/why_does_my_hot_tub_keep_saying_e02.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_9d78b2927b0b43e69e55393e691fbfb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e49fc9-2ceb-461a-b4fc-2aa2e540d171/wunesirovazenovil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453413b2-4ac7-4c16-bb33-94ffe809402b/nixon_sentry_chrono_all_gunmetal_42mm.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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 5192 bytes
SHA-256: 894f98361118308b233de58e8be7684ea6c4873949e4eac1b800ff666016f4f8
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 10664 bytes
SHA-256: 52ebacebb68682c96c68495db9f6fa0c56d420a75aaadaf6003962014c1167f6