Malicious PDF — malware analysis report

Static analysis result for SHA-256 c123685e56360510…

MALICIOUS

PDF

73.1 KB Created: 2021-01-10 01:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ab0cd1e84106465d808c6548b972e8a6 SHA-1: 7e24bbca514cc760b6ee81307c659f2c41630182 SHA-256: c123685e5636051033cb9699febd6b91c99c7dbb48cb4f8cf5312368e7cba3a5
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 detection strongly indicate malicious intent, likely to lure users to download further payloads. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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/123?utm_term=pictures+of+montana+mountains In PDF document text
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/7495399.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/VJid4hd/my_block_app_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/ihaggu5/mumedojafujedegit.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/pajeriramal/best_android_games_reddit_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/tavovevamavakogezesofex.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/72112722432.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/ielts_writing_general_test_samples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/53311712514.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/87121161183.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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 4996 bytes
SHA-256: f5314416dd4f9066de05c5d2ca57dbe8221a534e1d527289e01f878f4dffc246
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 10588 bytes
SHA-256: 8c893d290f5dcaf9dbbca9319c777a25e5f979050a474742eed407dc31898225

Open this report in the interactive analyzer, or submit your own file for analysis.