Malicious PDF — malware analysis report

Static analysis result for SHA-256 246dca5ed51c8aff…

MALICIOUS

PDF

71.8 KB Created: 2020-12-14 02:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2c10d508610f6e108eeee15053e184e6 SHA-1: 7a1fe0390324bfc583a532851d0df6ed80146cdb SHA-256: 246dca5ed51c8aff085a23438accb2e2a20ac3c34bbd4bd025ccc223002214fd
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, with at least two pointing to known malicious or redirector infrastructure. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests a phishing or link-farming attack pattern.

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://cctraff.ru/aws?utm_term=shutter+count+canon+6d+free In PDF document text
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/kasovaxubutisutow.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/38e4dc0d-8344-44c1-a794-dc9e56d909d2/where_was_the_bar_scene_in_footloose_filmed.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/timisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67425544-b53f-4b2c-a0f0-e3956a48ecc8/bimaropobowojeboxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/47204038030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681942d3-45b5-4bf6-991c-eeb2740f2e3f/aplikasi_picsay_pro_apk_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27faaba4-4be1-4a23-8067-44e5bbbde9dc/8081982337.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/brain_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/in_the_bleak_midwinter_sheet_music_ssa.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/nuzusuguburudo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc100ee92c50b1a1e781c95/t/5fc65c6961e25426e11143c4/1606835306370/94699626064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cca81d-7c18-4c4d-b3ee-ba199d7b9853/50116206175.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33495affbf90a66f9667f/t/5fc751b68f079636157867a6/1606898103690/is_pull_the_pin_app_free.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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 5156 bytes
SHA-256: 381d49f616fc6df0679708a0d2bd4cba01c3220f9e922911f03c65fbd954040f
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10460 bytes
SHA-256: cc88eefeaeae82b4e7ea80ba17daaaf9be13db302ea34c085859c3efbe843794

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