Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43d5d11ae0bcd20…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 15:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 87ae57e93b4252ef0747304179b01f86 SHA-1: afb06ac9ec23fddacd3a62ce82b77a5b41e66006 SHA-256: f43d5d11ae0bcd20b0e3650c678c40421cef64d614aeedef92f38028ff757434
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=aniones+y+cationes+definicion+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fefb57a63598.pdfIn PDF document text
    • http://nurigufasuvunu.iblogger.org/antenna_theory_for_gate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_604da8414c7d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369911/normal_5fe428cdbfde6.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/coleman_furnace_parts_edmonton.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_5ff5548794459.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/collocations_with_have_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropasibemufi.epizy.com/company_profile_template_design_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/smart_goals_template_ppt.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_84990576a2a5428faf4fd1b4ab8337f0.pdf?index=trueIn PDF document text
    • http://diwigivexuvobe.epizy.com/10135752993.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/82187752804.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_40fb1b153d8e449c93c738f0b7663170.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/44006170046.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_7cf83c4fc20e4212af7fc445060cb259.pdf?index=trueIn PDF document text
    • http://jumepenitujox.atwebpages.com/70683164324.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/topuvadizulakavoto.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/compensation_philosophy_template.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_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 5112 bytes
SHA-256: ef601fbe9ae31f93977040a3aa1974fca39ff5397750b8aa86c3364a638e1183
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 12092 bytes
SHA-256: d3b30d2232dd5699ff8a69050b824e5c553930579ab8eb8b697b572606f1f118