Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72dccebd38790a9…

MALICIOUS

PDF

78.5 KB Created: 2021-05-11 09:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: feabfcd1f43e972298a0a34520ae9ab1 SHA-1: adecf5c243d6c36e17a99d37f4dcb312bc84e552 SHA-256: d72dccebd38790a918e6d67f929f0b496b8bcb044c8eea13fc552ebc5054656b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically related to phishing. While no scripts were extracted, the embedded URLs and the heuristic findings suggest the primary goal is to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=how+many+chapters+are+the+in+harry+potter+books+2020 PDF link annotation
    • http://free-at.pro/748035160326ruo8.pdfIn PDF document text
    • http://girlita.space/mewizixofuruzezonawutoxashw2.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/1954743.pdfIn PDF document text
    • https://xofudafitigo.weebly.com/uploads/1/3/5/3/135327781/f194084.pdfIn PDF document text
    • https://vidijizuv.weebly.com/uploads/1/3/0/7/130776341/947ebb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_6014f8fe6fa4f.pdfIn PDF document text
    • http://kvrovk.xyz/6_core_values_of_social_work_explained0h5hy.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/towupejok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_604669f90ebe5.pdfIn PDF document text
    • http://kind-insta.site/zafovirovopoxab1teql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_6054ea209542f.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/ddae8a32-857d-4e3f-bd09-8fc8cecb7a97/29633768423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66975419-b4d6-4787-b874-c3c4de6ee496/emergency_care_13th_edition_free_download.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_832a5920f4d34b149ee7e906be910a74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fcc0d9-ae94-4d91-a3cd-1c0f0a364432/nawuz.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/vabovedesizinojavosoxo.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_1bc577946ff04eea81f415ff10710b9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kosamupim/pojofavofisila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808a4c44-90df-4af9-909f-6587bf27a122/what_is_a_home_remedy_for_calluses.pdfIn PDF document text
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_73a4c5057e49403fb09ae91725a0a0bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd6bf763-d82d-4aaa-8ade-0af5d91917c0/which_of_the_following_countries_has_the_highest_gdp_per_capita_in_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/verili.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/bandura_s_self_efficacy_theory.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_6159c6d34f224388b4de286e9dd22de1.pdf?index=trueIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_6ccac90768c5473791dccf16a20628b8.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_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 5772 bytes
SHA-256: b1e6c088a8c120c4f7ec61555c8c199abaad5daf53c186b61d4befc9457d34e3
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 11428 bytes
SHA-256: 00f2ed78a944e0070c266f6d9d8fc925ae4d8481ff226990f7ed8634f93a6a0e

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