Malicious PDF — malware analysis report

Static analysis result for SHA-256 9607db883447c8ab…

MALICIOUS

PDF

116.3 KB Created: 2021-02-15 10:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c2ad8d18e00abb5149bc09cb1fb3f1b5 SHA-1: 494980fcb3c9337e0a2085b71f8f2fcfaab98c31 SHA-256: 9607db883447c8ab95ee65a977cc9e8ff820426d483e4a41239ca30695f228e0
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious PDF files, indicative of a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though garbled, suggests a lure related to educational content, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=nationalism+in+india+class+10+pdf+latest+edition PDF link annotation
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/razedunaduge_belujexudonevo_gamir.pdfIn PDF document text
    • http://bigops.fun/pdf_bestand_versturen_via_whatsappus2g7.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/f3957259231.pdfIn PDF document text
    • http://evakuator-uga.ru/sedekugezobupabavejufasa7b0ji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_60255417c8e41.pdfIn PDF document text
    • http://retys.fun/vector_t_shirt_design_templatexjicg.pdfIn PDF document text
    • http://venira.su/bollywood_best_comedy_movies_free6amis.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/mubikemamobufovowaqhhi5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383567/normal_5feb35dc606d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_6028ba6491229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/forklift_truck_theory_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/autocad_2014_64_bit_installer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/risk_assessment_form_template_for_schools.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/45695217877.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/blocky_cars_online_mod_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/zukosume.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_off00017b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B05 5368 bytes
SHA-256: 293df19971870f6e80b86752097d1568f00e605869d272a3aaad4cac32f88aa9
font_01_sfnt_off00018d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D45 10968 bytes
SHA-256: 088d032ffb0a59880ebf7aecaba5ae2af29f8dab5e403c33cccdd80e9784dff0
font_02_sfnt_off0001b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B28B 4476 bytes
SHA-256: c205acaf3f3be283329255c73700ea6e823dad90bc6cc986a5c9247531aa9fc6

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