Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dce42e9afdc0b78…

MALICIOUS

PDF

70.8 KB Created: 2021-02-14 16:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f99c54b107116fc5994859cd9a58bf9b SHA-1: 50c2c70ec8b6fa47bde8bc29d279b976176bc607 SHA-256: 9dce42e9afdc0b78552072dfc50b926b07d611baed37332494447e4fb7e9aab3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/123?utm_term=dean+braxton+book PDF link annotation
    • https://sewowifef.weebly.com/uploads/1/3/6/0/136082850/pigakosijurawituxor.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/biwakibuzojenugulib.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/6966117.pdfIn PDF document text
    • http://extraterrestrials.space/classroom_language_exercisespge3.pdfIn PDF document text
    • http://devlp.design/25383414131lwh3x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5ff779b9317e6.pdfIn PDF document text
    • https://cdn.sqhk.co/safajoju/jb5Gnib/roblox_werewolf_mafia_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/ghuij2i/80662367229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490127/normal_5fca72fc0b3e9.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/xebes.pdfIn PDF document text
    • http://getallcreditscores.info/otras_maneras_de_usar_la_bocamo9if.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://s3.amazonaws.com/luramamelolem/action_linking_and_helping_verbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/ararara_new_marathi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/40327641266.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/tegunupixumizorawotudatif.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_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 4480 bytes
SHA-256: 3df0a874406ee88eebb89ce9b5f1684ffd2a6df3d971f860036900d3383b1e64
font_01_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 10908 bytes
SHA-256: 2fd6c4f0e7091ea31e0fb439c525f8b4f153a91e8070645b1a4fb0f3cef48654
font_02_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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