Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af600991ff44cb1…

MALICIOUS

PDF

67.5 KB Created: 2020-12-02 12:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba759e00c9630ef30b6263f091e191c9 SHA-1: 165cb03b2b56c0d68bfafd3aa1dfd002ffe306d9 SHA-256: 5af600991ff44cb1be33dbd302646d35d338ca76d426fb9912d6472378c358bb
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious or spam content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

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://traffking.ru/strik?utm_term=escuela+para+padres+educacion+especial In PDF document text
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/1334388.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/botefekenu.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/fadedosi/genie_garage_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/81671244890.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/52781669195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbccbfc-8fed-453c-b295-df3af0fc465b/striker_2.4_ghz_drone_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/xakanukin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf48018e72e5fdb9c2da3/1606284420781/zazegi.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/bastable_nurse_as_educator.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/xujosepuvowolisijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238de471-1f20-4675-8b28-daf8a0331d0f/fina_logo_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494a380a-fca0-4c1d-ba52-ff86c14762b2/ankeny_centennial_high_school_graduation.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_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 5024 bytes
SHA-256: 92e95c0ac2698ae531725296f422bb061de28941c8b57f827a05ac7b654d2ae4
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 11108 bytes
SHA-256: ca02a2329d256f6ba77620d2a8165e1d611cde1aed1905e4d4f618254a5ae81d

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