Malicious PDF — malware analysis report

Static analysis result for SHA-256 3176d19f09065376…

MALICIOUS

PDF

169.8 KB Created: 2021-03-24 13:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5095be85df08f94d91757e45c8bdb0d6 SHA-1: 7b126ac43c72c18f2621fc6114a805f53174ac4e SHA-256: 3176d19f090653766e58bd10498648201f6e0314f09b26d034ce14f27cc60b9b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=smothers+elementary+school+washington+dc PDF link annotation
    • https://cdn.sqhk.co/talokelom/Ciejf4j/490716386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_602c029aaa5a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5ff7ff19daac3.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/aaGhivn/acellus_login_teacher.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/cfizRkA/descargar_puzzledom_classic_puzzles_all_in_one.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5ffa227f02af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_5fd159eebfa67.pdfIn PDF document text
    • http://sowivonowiso.iblogger.org/epidemiologa_clnica_investigacin_clnica_aplicada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_60436a9c9d5a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9c4245-dbbd-4ae5-a35c-d76f838c00fd/duroxovibonedovexij.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_9e465d59b647453c9e9dd3d757b8e19b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdcc71e0-bdea-4298-9b1d-0a36d16c9cae/18474085859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd35a909-e029-4e25-a021-f532664db615/tabozuxojimarosowujomepe.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_038ebac8b34b455db4ba5f8364634e78.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_bd15b02551a648a9a49a3ac02980a157.pdf?index=trueIn PDF document text
    • http://roxifopovarag.rf.gd/74666968357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f3f4dd-6dc8-4508-bf96-ce25ea6984ad/26108997146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07fe0f5b-1e58-4c98-8986-22a8ac4a7667/is_graco_contender_65_faa_approved.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_off0002602d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2602D 5648 bytes
SHA-256: ef1826ebe6ba31831439490470b4c0ae88c9dd5748fce68a801721258c374337
font_01_sfnt_off0002734a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2734A 11516 bytes
SHA-256: 4fda3abe1625ad7f4b8e55a218d1f02468d8ee6e2ece32deb65aaa4ba5f8f5db

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