Malicious PDF — malware analysis report

Static analysis result for SHA-256 e245e74433d4152e…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 07:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8e0377213b384d7d026536a4ebc76dd2 SHA-1: 260dcffe42054a96a3933fdea65f1f8dc7b0608a SHA-256: e245e74433d4152eedd7c99e4b9f9df345579b1569a9217a642024ade460baf6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to numerous external URLs, including one with a 'building falling down in earthquake' search term. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a social engineering tactic to drive traffic to potentially 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://seumenha.ru/strik?utm_term=building+falling+down+in+earthquake PDF link annotation
    • https://cdn.sqhk.co/nejajevafode/ZMji4jd/97391828221.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/eac8c8effd.pdfIn PDF document text
    • https://lupasunalijifaw.weebly.com/uploads/1/3/4/3/134385939/wivoguzi.pdfIn PDF document text
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/fokonoxa.pdfIn PDF document text
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/gemabagikum-lipizok-rogopedap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498392/normal_6007953392e28.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/bivene.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/472773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_601a707eda40e.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/mefevuri.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/jicpcbk/price_is_right_live_reviews.pdfIn PDF document text
    • https://mitalukomajamo.weebly.com/uploads/1/3/1/4/131437074/riwuradokitujojosaz.pdfIn PDF document text
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/vevunenodeki_mikabamutisopak_lukugev_redera.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/haysjcP/wimizetijisesomofiget.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/ruger_sr9_vs_sr9c_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/tifokawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c10647-064d-4282-a224-a021414755f3/65350230165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc26953a-2229-4d1d-a6e1-7c4aa8e0a8d2/jesugexosuwusevekalep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2df25a-28fb-4a40-9ac6-0de283949042/citizen_mens_eco-drive_titanium_watch_blue_bm7170-53l.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_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 5324 bytes
SHA-256: 931cb79a45c6771732c3b377fc10c34de753537b654e71886539058037021930
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10680 bytes
SHA-256: bde84d65cc8a5ba4d06f01ee611ce2ea127803c0f0622d71a0c84d32fb89d737

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