Malicious PDF — malware analysis report

Static analysis result for SHA-256 774c4abce2c30c49…

MALICIOUS

PDF

74.5 KB Created: 2021-03-31 01:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 93eafe458749f212097a21874baa3a25 SHA-1: 55102d85aa9b592379dfb2144b6b915c4ce62a2c SHA-256: 774c4abce2c30c495ee19c465c27f7e4b37f01c18621517ddcf86bbf950a9a61
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://seumenha.ru/award?keyword=interpersonal+skills+for+project+managers+pdf PDF link annotation
    • https://cdn.sqhk.co/fefamuve/cqHjrkB/24467060298.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/mrhhesX/disney_movies_list_animated.pdfIn PDF document text
    • http://islandlandscapesbb.com/allotropes_of_carbon_and_their_usesf6sfa.pdfIn PDF document text
    • http://gazzsheff.xyz/vamifitoxilubusiseyj7hx.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/p1uvuTM/panchatantra_stories_in_telugu_with_pictures.pdfIn PDF document text
    • http://sravniproxy.info/652415248213gaz7.pdfIn PDF document text
    • http://anarchymedya.com/estandares_y_expectativas_de_matematicas_2017u4rn7.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/jd8i6rK/pagenomituzikuwaf.pdfIn PDF document text
    • http://hookup668.site/how_to_factory_reset_iphone_6_plus_with_ituneszk3kc.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/0e81fb5e-58bb-4360-b048-2cbb67d61c85/ledevafukufozosepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1502d7b3-7dca-49c4-a060-c4348df4986b/2423798759.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_134fbb1c3a5d41c49930c71de6b421c7.pdf?index=trueIn PDF document text
    • http://fagaxasugomu.epizy.com/dogilozunos.pdfIn PDF document text
    • http://nuwumexuxesi.epizy.com/969108086.pdfIn PDF document text
    • http://zimaroted.rf.gd/84638621444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80846eb1-c6be-48ed-8db2-7a434e67ddf4/como_yo_te_amo_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce85828-2541-434b-b3df-4ab2607ae316/74745155916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48f5944-73ea-487d-bab7-05917c9babb5/dark_souls_1_character_creation_male.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c4b849-71d7-488f-a940-d1dc91ea39f6/41333769379.pdfIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_62477301fb754e3c80eb01fe2a518a0e.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_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 5552 bytes
SHA-256: cd5614b7c0e120e9e02eb14a2b57d2e6e124865897bcb04ee3f70412d78bc135
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 9880 bytes
SHA-256: 8dd3597958f4422c1a5b1f4270e28bf06655715790745fc30794500776f159ec

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