Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8b022de5b81f3c…

MALICIOUS

PDF

97.4 KB Created: 2021-03-03 12:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 77564deea19bd4b6f21f6e196ab51d16 SHA-1: 699e4297ad8648c7e93f1b7ec64e59627c45c4cf SHA-256: 6c8b022de5b81f3c8ed030ffcff65c7829a6bc267e628da49c819af6cfc5646e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=how+fast+is+a+model+3+dual+motor PDF link annotation
    • http://mon-fortuneo.best/composition_of_transformations_worksheet_answer_keyac4nk.pdfIn PDF document text
    • http://zalavovira.22web.org/mudamigasewuvetafe.pdfIn PDF document text
    • http://kuvonej.iblogger.org/niximi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_60314969ab487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_602e229bd0b8f.pdfIn PDF document text
    • http://gufutaca6.xyz/whole_life_challenge_food_listd8rsq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6031f7b8533b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_602184bda9227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fc996b7b45f8.pdfIn PDF document text
    • http://baby-slings.ru/usps_return_to_sender_codesbzlh8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowavironipomiz.epizy.com/free_antonym_worksheets_for_3rd_grade.pdfIn PDF document text
    • http://getomijos.rf.gd/francis_chan_forgotten_god.pdfIn PDF document text
    • http://zisubaripuxiba.epizy.com/33935488452.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/charmeleon_silver_rg_movie.pdfIn PDF document text
    • http://nebugobebakejef.rf.gd/fugimuxebewuveza.pdfIn PDF document text
    • http://zilapiwet.epizy.com/opsc_assistant_section_officer_exam_books.pdfIn PDF document text
    • http://rojapamun.epizy.com/49496045659.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_off00013fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC9 5268 bytes
SHA-256: d9da6053d62af7bfe5e2e2e1da188ccbd5976b29f794439451a0d72b9dafb940
font_01_sfnt_off000151af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AF 11420 bytes
SHA-256: d008c3fff09bedff3ea18aa33dfceac0e02ce1285fa157519248cd2a29067744

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