Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8e1cbd313dd75d…

MALICIOUS

PDF

74.1 KB Created: 2021-04-14 18:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 00359d9b6fc662ef3ef92220cd5c428c SHA-1: b37f3fc11d3b1bfa7f604f4b68633bb78cec258f SHA-256: 0c8e1cbd313dd75df375c9870ad2f212fb9ed7ac2b84c644592deee099e43d36
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. While no scripts were explicitly extracted, the presence of numerous external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware delivery.

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://resalured.ru/strik?utm_term=physical+therapy+books+free+download+pdf PDF link annotation
    • http://zefujixa.mywebcommunity.org/49560462785.pdfIn PDF document text
    • http://raicen.com/english_grammar_test_app_iphone8jzks.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/A1Tshgd/26531983713.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5ffbbca8be74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_6053b1bf1df92.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/states_of_matter_grade_4_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fc89dfc67272.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/whirlpool_thin_twin_take_apart.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/bjfY14f/77626360362.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/vomagepurarubezijoburoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_6015b9e45c8b5.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/BgcHjgt/mekuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/zobazulibes/igeWAGB/aquos_net_vs_android.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/kudukufoctvoa.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/eZiiZqf/rank_of_a_4x4_matrix_example.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/bowijodalezemukut.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/bjjBh31/scalextric_c8438_arc_air_pro_wireless_hand_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/ejheifc/16322754541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_3f8ab0d158c744bda25b31476f1c8869.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_027840537f884b828b6bf40e7bc6bbdd.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_f337f7d14a5f4f17a295f1ac72c0d6d3.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_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 5640 bytes
SHA-256: b9d6a1c660942be8b6a578c095d8cd1d3fbbf7c68ad01c6e65196f2de6c2c668
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 10384 bytes
SHA-256: 9ddf946d9cb569f82a0358f6594b20c62f711a19b0b33b708b99cc5469871c03