Malicious PDF — malware analysis report

Static analysis result for SHA-256 af025f512783cef8…

MALICIOUS

PDF

64.5 KB Created: 2020-12-22 05:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5f2dda00440c30688535275e0212acef SHA-1: 7569488727189b729426629927471b27d7ec4b8a SHA-256: af025f512783cef8c76ef1bf6c9eddb908804e4df0d69a42fd4c9b663128c5f0
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure related to accounting worksheets, likely intended to trick users into clicking malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=journal+entry+worksheet+accounting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5f996fe073b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_5fb9942a01a2d.pdfIn PDF document text
    • https://fajalosi.weebly.com/uploads/1/3/4/9/134901252/243370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fd368b5ddf24.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/jijufilaxope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5fb4a0438d8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5fd1c6838a14e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f2f6c89e1c4b8fbea157/t/5fcf674714319a51dc315cb7/1607427912032/bass_pro_shops_promo_codes_september_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/bootstrap_search_icon_in_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc285ac5e8e827d42982ab0/t/5fc4da956457125654d45d55/1606736533639/lepurixusajebolaniwuguxe.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/romanos_hernandes_dias_lopes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdd0c5c-5d4d-4da5-adce-3fae18f599d0/81914802443.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/rational_numbers_class_7_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/beauty_instagram_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/android_collapsing_toolbar_text_color.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_off0000bfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 5308 bytes
SHA-256: 53155478d880f6ba383f4504a32d6aa467d96e6315e44dfdccfb80b8aff31ee8
font_01_sfnt_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 10392 bytes
SHA-256: 80e6fb82e6d0e26072f3fd0616255fbf0305a677604424fa1e6162bf46bc7394

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