Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3c3ca3273d5dfe…

MALICIOUS

PDF

67.1 KB Created: 2020-11-13 21:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2e82995e706694d846632299209a3647 SHA-1: d5bef8cbaf2ea6e54265c03feec216b0e61742c9 SHA-256: 6c3c3ca3273d5dfe8c542a0227aaac100472a3569c2ebb553afb214c89aeb204
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=dunkin+calories+iced+latte In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_5fa5753843586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fadb8f7436dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5f9dc6dfa47bf.pdfIn PDF document text
    • https://dexoxewivovevub.weebly.com/uploads/1/3/4/3/134322619/1282166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/de82f426-5650-40b6-a2b6-0198f0bbfb32/how_to_program_jeep_key_fob.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/rogisurasow.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/21721114191.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/33511424103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260c1264-608e-4bb8-9d78-4f603f356450/thank_you_invoices_have_been_sent.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/111_angel_number_love.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/convert_to_standard_form_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/analyse_au_bonheur_des_dames.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4C 4880 bytes
SHA-256: 609e6f1dd856bd8e2a29b7bba85b20abbcbe0df367522cf586d6628cfe014b14
font_01_sfnt_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 10376 bytes
SHA-256: 61792fd65d7cfa1196b31d1650f550319c8b6643a40112f758c15be5f8177642
font_02_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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