Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8e0d4828585603…

MALICIOUS

PDF

99.6 KB Created: 2021-03-17 09:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0e281f7c654bcc58f3684109ecf4112b SHA-1: 0752f1f85f5c79af8880a83a4837b4f45f9dc12e SHA-256: 5a8e0d482858560367f5b90653cb412e32bccb186973c1f365841b3fcda20d65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan threat. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites for further exploitation.

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://midufefew.ru/strik?utm_term=bodega+dreams+chapter+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480893/normal_600cc35357342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_602ce4507e2e2.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/hdSjhji/zombieland_cast_1.pdfIn PDF document text
    • http://ru-payment.casa/32842441072b8wut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_60357a4d3fd03.pdfIn PDF document text
    • http://wei-nmvc.com/kagigiwaw0ypb.pdfIn PDF document text
    • http://paypallsecurity.com/rustoleum_cabinet_transformations_top_coat_yellowingm7bv2.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonopilil/jbP9cRM/163878523.pdfIn PDF document text
    • http://vashastrahovka24.ru/6813562961s861p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_604a883767cd3.pdfIn PDF document text
    • http://sollabs.xyz/zoom_g5n_review_youtubelv3an.pdfIn PDF document text
    • https://cdn.sqhk.co/zitajazasu/OUieCjf/notepad_free_for_windows_7.pdfIn PDF document text
    • http://milky-rp.space/what_are_the_key_attributes_of_a_systematic_reviewng76q.pdfIn PDF document text
    • http://ranixug.iblogger.org/collybia_trip_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://meziwupagev.epizy.com/messenger_app_windows_10.pdfIn PDF document text
    • http://menimilerawapo.rf.gd/sikoveliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86725216-ed70-4cd0-8dbb-12027762df1b/kunanixunojuvedezefitujow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac88f8df-5d38-4895-913d-a74bb3f451e7/faviridulawelifomugak.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_off00014aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA1 5608 bytes
SHA-256: 97bf0043c79cd104d237b627ac6b964bd674f50fc9e3da35fb2f0a4ced472303
font_01_sfnt_off00015d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D99 10360 bytes
SHA-256: 54d4898d0f6502cf181cbdec50b6ef23e3b63c76ceada3085f99f05681a9fe6e

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