Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6a0f64ce9c90a1…

MALICIOUS

PDF

75.8 KB Created: 2021-02-13 21:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6592523f22b39b7465e3209741f430bd SHA-1: 58c260eb61872567b5aa52cc37e2bc3894ee9c5a SHA-256: 5c6a0f64ce9c90a152d659788d03231b4d78e17dbcbc3a95952dc7d40a0e6e09
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=kinemaster+mod+apk+layer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370560/normal_6011d7aaac170.pdfIn PDF document text
    • https://pabafuneb.weebly.com/uploads/1/3/1/6/131607185/6416198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fd7dc597afd5.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/g4UpyBi/81129792425.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/jajdgeA/schema_electrique_lampe_avec_detecteur.pdfIn PDF document text
    • http://terem.space/formation_of_the_solar_system_lab_answersb9k8j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_6019d656bf79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_601728a32913a.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jhfggjb/pencil_case_items_in_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fee0e9b65000.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/YjbcBhd/world_history_book_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/Vflic3H/can_hair_salons_open_in_san_francisco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416806/normal_5fccd61e5ad2c.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/kovibu/automatic_car_parking_system_project.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/fisaragumu.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/97217355475.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/edital_concurso_araruama_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/accidentally_engaged_movie_480p.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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 5240 bytes
SHA-256: d6bd01519b3e64ae084a13b837f6718ed2f9e0b5272470db283eba9ca66ba1ea
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10704 bytes
SHA-256: 4fcff86c2c4e8db8b9ad5f6f658850cc8ecc7f857fd97167171f5a95f64fa5cc

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