Malicious PDF — malware analysis report

Static analysis result for SHA-256 390a42eba16efa7c…

MALICIOUS

PDF

73.3 KB Created: 2021-06-05 10:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a968e783c2456684f8df8d8cf1c61ef SHA-1: 9678965ba437f2b35a71f3f3e6bfeddda51594de SHA-256: 390a42eba16efa7ccb7481a56facd2c13fd6e33050b7599bbdbac1585bc3ef6b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various PDF documents. The primary malicious URL identified is 'https://jottigo.ru/123?utm_term=frog+dissection+introduction+answer+key', which is likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

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-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://jottigo.ru/123?utm_term=frog+dissection+introduction+answer+key
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/6580894.pdf
    • https://cdn-cms.f-static.net/uploads/4466679/normal_602307bf1d93b.pdf
    • https://cdn-cms.f-static.net/uploads/4380680/normal_602afa1975cf2.pdf
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fda3a2e77e20.pdf
    • https://cdn-cms.f-static.net/uploads/4460982/normal_6022d33e05d1c.pdf
    • https://cdn-cms.f-static.net/uploads/4368248/normal_601e2ba079c96.pdf
    • https://cdn-cms.f-static.net/uploads/4461249/normal_601aeeaf4a8ca.pdf
    • https://gabixolip.weebly.com/uploads/1/3/4/4/134492453/pawefavive-disukodavabobo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/872bbabf-ed72-45ec-ae9c-dc8683d8a5cb/the_kissing_booth_2_ending_song.pdf
    • https://uploads.strikinglycdn.com/files/de6df825-b7c0-4288-abd2-d32e96f48b3b/xiredusivivimuniririsopur.pdf
    • http://lakebimutep.pbworks.com/f/45837877842.pdf
    • https://uploads.strikinglycdn.com/files/5dc35941-4316-40cf-8791-01d56f989231/hl-3170cdw_wireless_setup.pdf
    • https://uploads.strikinglycdn.com/files/e34e271a-8e48-4b93-b261-23ac38dedf8c/94509383138.pdf
    • https://uploads.strikinglycdn.com/files/bb66f71f-dfbf-4cc7-a6ba-6e9650f8ca89/81721096502.pdf
    • http://vafobotigef.pbworks.com/w/file/fetch/144526311/sabatareti.pdf
    • https://uploads.strikinglycdn.com/files/2433e9f0-fb93-4e23-a9b8-626f67e9bf73/70647140278.pdf
    • https://uploads.strikinglycdn.com/files/01ad1212-e035-41c2-b6e4-97859646b0a8/bupakiwuv.pdf
    • https://uploads.strikinglycdn.com/files/fbcef3f1-ee34-407a-ab18-90c6267deed3/how_to_make_a_custom_alarm_noise_on_iphone.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_off0000e2e8.bin
b3dc90ac380fdd37567f1950cc65383c7a92a020718095d4cd891914c08cde63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 5288 bytes
font_01_sfnt_off0000f51b.bin
0ac4e6aaa17a0ede6e16d74affc6775c3fc49d854315c2e52d0a9ec0a9db73a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10228 bytes

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