Malicious PDF — malware analysis report

Static analysis result for SHA-256 662778d4fab83063…

MALICIOUS

PDF

78.1 KB Created: 2020-12-15 04:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5d746dd1fee1dac6218a1f24396166cb SHA-1: 78aef526bcb1537ca7d41fb475ddea82fd75017d SHA-256: 662778d4fab830637f07e9e570a55a98a36455eb57fa3b7da148e4af22e79d19
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to malicious sites or download further payloads, aligning with phishing and redirection tactics.

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/123?utm_term=lucina+guide+smash+ultimate+reddit In PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/b7f28122f.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/f628faee8.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/5992c3.pdfIn PDF document text
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/3508181.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/tadovu/55761754562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459a2e75-02fc-450e-af47-0298c7bbbd26/free_paradise_bay_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/53686915007.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/gmail_email_templates_with_attachments.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/fire_emblem_heroes_beginner_guide_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a944df17-3d63-4b87-b337-466daa2732c4/73339284579.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/bases_purinas_y_pirimidinas.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/chemical_change_vs_physical_change_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbceea029c5e26690247cad/1606217380274/womikejelewepigaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51d3bc89e1c4b8fd9e252/t/5fc602ec18e72e5fdba5e870/1606812396510/what_paper_tells_you_how_deep_your_well_is.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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 5292 bytes
SHA-256: 90bcc71fe7c1117b8727d564a6c96764819188a5f685bb0f5afda9d88c1a1104
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 11132 bytes
SHA-256: 703d8a9ead6105fc207ba34adbaf9caab724066d3d41579081601000dbc35ca2

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