Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a0338954e6e4bf…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 03:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bd0a6bf44b498eae53b1eadf29e505f SHA-1: a246be590ab398b2569c7209f31f7877a3cb76c7 SHA-256: c9a0338954e6e4bf00c0d3f8e237ed41ae5f13fc53a0238f3124abcef1915e12
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=mygrammarlab+intermediate+answer+key+pdf
    • http://passive-income.ru/wupiwuxaxexugurctctc.pdf
    • http://rabemedexisubis.mygamesonline.org/jekib.pdf
    • http://help-business-media.com/hp_probook_6560b_drivers_for_windows_7_64_bitrze3c.pdf
    • http://pusewuvi.medianewsonline.com/ncert_psychology_class_12_download.pdf
    • http://mysteps.online/wukinogujueiz47.pdf
    • http://nupewijanetari.medianewsonline.com/matlab_free_download_for_mac_os_x.pdf
    • http://supsun-aero.com/what_is_the_ode_to_joycnqz8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b8163e46-8474-4f71-90db-52643b2b969d/lg_bluetooth_headset_hbs_730_battery_price_in_india.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_dc4483aae30b45d1aa649852621d2840.pdf?index=true
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_cfa0a10b32d241e88f4610137178907a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/afa0fe44-34ff-4ffc-bb01-493aa1514593/what_is_worms_eye_view.pdf
    • https://uploads.strikinglycdn.com/files/e3bf869d-5280-4d87-bc18-246882ee1a49/why_is_my_hp_printer_printing_blurry_text.pdf
    • https://uploads.strikinglycdn.com/files/86b34815-bb19-4fb7-9203-e92b6bd86097/mexufajobofesa.pdf
    • https://uploads.strikinglycdn.com/files/cbafc699-6494-46da-becf-3b9e58700fec/how_to_get_a_management_consulting_jobs_in_uk.pdf
    • https://uploads.strikinglycdn.com/files/3e67e00f-8680-49b8-939e-3c5c739c80b0/photoshop_photo_manipulation_tutorials_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/81f1743b-5680-4595-a02a-33c907d4f001/12294281705.pdf
    • http://supuwevul.atwebpages.com/mathematics_syllabus_d.pdf
    • https://uploads.strikinglycdn.com/files/60ea591b-9d19-43aa-8297-75b00fff11c0/is_840_a_bad_psat_score.pdf
    • https://uploads.strikinglycdn.com/files/fd6c022d-ec21-4c0b-92eb-bf5a1a9f970b/how_to_set_a_haier_fridge_freezer.pdf
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_b0f97d81e84c426dbc5c13aebc8cccfb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bec2ff64-ca77-4347-b0c3-2defa4627810/sejukelefaxobimax.pdf
    • https://uploads.strikinglycdn.com/files/bcf5db12-ed49-4d93-a2c8-638e6856e853/81522790415.pdf
    • https://uploads.strikinglycdn.com/files/719bcb18-60cb-41d0-a49a-a46a5049871b/vofuviraponavixitope.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_off0000ee95.bin
2f3f06a0f75ca4e207d6b0b91c9c670aad8e1902b1c59ff80e65928e4307f9e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 5764 bytes
font_01_sfnt_off00010246.bin
1fc5bf0317d716baa8f3019259408d7303b6282c79d67e0744df6237c21941af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 13060 bytes

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