Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbaf00586950d04…

MALICIOUS

PDF

74.2 KB Created: 2021-03-29 05:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e9c6c2f5ef0c443b9739af181a86c2d5 SHA-1: dc13316d1369f8b251a973132893b161dfa93eb7 SHA-256: 0fbaf00586950d0483e6a0e5f1caa89c3d4d30307cf8eca98eba8d8d570629d5
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 identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/123?utm_term=variety+of+language+pdf PDF link annotation
    • https://cdn.sqhk.co/semegopo/idO4ggd/resedatewakovexu.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/iz7jSKu/loud_volume_booster.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_6002fd4f48159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_6046ab54b5bed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391623/normal_5fec594b67941.pdfIn PDF document text
    • http://mezogevap.mypressonline.com/vogugibawejumowafeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_5fe93a539cbe4.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/QsjbhiZ/87896371984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5ff2a5a23abf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_6013e4f5b9091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ff691b700955.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/attestation_d_assurance_automobile.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/hjRoVo0/initiative_tracker_excel_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/wjjhgie/george_strait_songs_2000s.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/pofewekugerubi.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/aims_and_objectives_of_primary_education.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_60326de2bd037.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/adbf6bc3-492a-4c33-938a-18d93195801f/72434441308.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/42145001807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71b84b9-da1a-439b-be35-f5421fcc8563/27183680825.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/acidoctose_diabtique_dfinition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3575416b-78e2-4a31-85ec-fc44efaac2ca/how_to_program_my_uniden_bearcat_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/rofogezopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea88ca5-8278-4357-93ae-ba3b5985aa46/67618159706.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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 5100 bytes
SHA-256: db2c3b99201cd9b187607a728cf2dde1b0ea5e5ca2322ba0fc87eda68dfb71d4
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10460 bytes
SHA-256: a7b4ba3c2dedf542b272def422b56d720f9c4930a3bef8b245c6aa1e351412b7

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