Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a9643ceee034c2…

MALICIOUS

PDF

79.7 KB Created: 2021-03-13 23:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e7dbe3f741b738ccc2a12f94b9ba3d3 SHA-1: d569f95239d171421f2589fd0f5142f527f5de68 SHA-256: e8a9643ceee034c234ef9b0e046a153004b1749d1827e5f6c60f1e825b29c5ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a large number of external links, many of which are likely part of an SEO link farm designed to drive traffic to potentially malicious or phishing sites. The document body, though heavily obfuscated, contains keywords related to search terms, suggesting a lure to attract users to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=battery+group+size+chart+pdf
    • http://jadogaxarabu.mygamesonline.org/miniature_dachshund_puppies_ohio.pdf
    • http://toworugesolur.getenjoyment.net/69039891246.pdf
    • http://jefuvumerusew.getenjoyment.net/skf_bearing_price_list_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4470399/normal_6013067f71303.pdf
    • http://xuvaxujogilo.mygamesonline.org/how_to_put_ink_in_hp_deskjet_2545.pdf
    • https://cdn.sqhk.co/gunonutib/fW9Vhag/78908088292.pdf
    • https://cdn.sqhk.co/fefavezevir/vFgfmFl/office_boss_truckee.pdf
    • https://cdn.sqhk.co/rozesivotix/ngjih7w/dapatop.pdf
    • http://fosipuzo.mypressonline.com/computer_science_for_beginners_books.pdf
    • https://cdn.sqhk.co/pabelewexo/gqhfqji/pioneer_sph-_da120_firmware_1._18.pdf
    • https://cdn.sqhk.co/mivadunoxo/aijwSTD/59152729758.pdf
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fec050200c98.pdf
    • https://cdn.sqhk.co/ruvazilu/enUIpQo/i_wish_you_were_here_movie_cast.pdf
    • https://cdn.sqhk.co/gabunufu/fghheSm/82015867481.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gixarewujedel.atwebpages.com/samsung_55-inch_curved_4k_uhd_tv_review.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_923ec8630aa8492a95b3b25f3307a436.pdf?index=true
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_aa327fbae2434152bafa1f9fbf501466.pdf?index=true
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_2e268a533f424162b76e081e35eebe89.pdf?index=true
    • http://resilasijajatil.myartsonline.com/coachmen_motorhome_for_sale_australia.pdf
    • http://nakeviw.myartsonline.com/witebozino.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e6.bin
4b9cf966e0aeb51ec5eb09110524900a1dc260ec05466a0cbf7a1e0cf024a873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 5584 bytes
font_01_sfnt_off00010cf8.bin
735bffaed606a15f54524de4e6d5539fa9147a5ce2f84416778f3ceb10444cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 10844 bytes

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