Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea8b72cde7b83a6…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 07:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ea1260835204d6609dda18b840e0050d SHA-1: b1b1ce5640f3cc40a7262c7149080d04c453fca7 SHA-256: 6ea8b72cde7b83a6517eab9842f6faeedf1032a04dc22828d482247c6d76ae82
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO abuse for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=study+guide+questions+sweet+bird+of+youth+pdf PDF link annotation
    • http://teksol.xyz/71744126429vte7v.pdfIn PDF document text
    • http://fepotarugagi.22web.org/authority_letter_format_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/LOhcKgg/tezowemumupisizuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/EKXIyha/hit_or_miss_girl_meme.pdfIn PDF document text
    • http://zaxofebejip.66ghz.com/monstrous_compendium_volume_1.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/OAygjfJ/fupirozizaketo.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/ck0PrwK/zawolejozedizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fd2fd21254f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381347/normal_5fe45b760ea5a.pdfIn PDF document text
    • http://topdouche.xyz/emotional_labor_in_the_workplaceum5b5.pdfIn PDF document text
    • https://cdn.sqhk.co/vafebutiman/suz6Gge/object_relative_clauses_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/gj9hhgd/xukubaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fc70c7357a13.pdfIn PDF document text
    • http://ninozefumuwu.iblogger.org/attendance_sheet_template_for_preschool.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6023691d1aa00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_afe2936c80d640c1bb8207240666d134.pdf?index=trueIn PDF document text
    • http://jasigobup.epizy.com/network_cabling_book.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_c8e746a6494e4aa784ff0370d3252534.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_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 5624 bytes
SHA-256: 50e667cab7d9e5447a7b1c527ac7dfb4d144892a646049b498a6b3c9d72a9609
font_01_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 10780 bytes
SHA-256: 7bf94972c9e38ea654cec73f38d405366a30e5fcea13abe7930241643d863513

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