Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8841233587d67e2…

MALICIOUS

PDF

78.3 KB Created: 2021-05-16 06:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 733c74008311ec21318be3c6e30d195c SHA-1: 78959ed7fc12a9ddc40ae376c06e7e7a6707e03c SHA-256: e8841233587d67e2fcea5565c9afd0ab926834154cd50f6749380b6c8854ffbd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt. One of the primary external URIs, 'https://jacksth.ru/strik?utm_term=girl+boss+episode+5+cast', is suspicious and likely leads to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=girl+boss+episode+5+cast
    • https://cdn-cms.f-static.net/uploads/4495402/normal_6061cd586e975.pdf
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/79173.pdf
    • http://tersq.fun/computer_networking_basic_questions_and_answersimykr.pdf
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/lujefavibopuges-kobal-pafedimito.pdf
    • http://babysampler.com/jepeg1wmnz.pdf
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/ce7bcf0.pdf
    • https://bafejaligaxe.weebly.com/uploads/1/3/4/0/134018432/3101966.pdf
    • https://cdn-cms.f-static.net/uploads/4425913/normal_60663f213960a.pdf
    • https://fixexetakofipu.weebly.com/uploads/1/3/3/9/133997797/gapoxololab_zunaperoz_jerefolifubos_xufujositepil.pdf
    • http://websecurer.tech/51682474449sybl9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3576419e-811d-4a3d-8a09-e05c24fddd29/35560384190.pdf
    • https://uploads.strikinglycdn.com/files/ea793fd9-e6e7-4c53-b70e-41d9b94eeb04/sutufetoken.pdf
    • https://uploads.strikinglycdn.com/files/6f089926-2615-4f98-b5f3-06aab4eceaed/tres_metros_sobre_el_cielo_netflix_cast.pdf
    • https://uploads.strikinglycdn.com/files/7673eab4-8a25-4dff-8904-2a04711c75f6/percy_jackson_book_6_name.pdf
    • https://uploads.strikinglycdn.com/files/ce153aee-054b-4659-b35f-a3c1fec5db7d/tesakedifiwixodu.pdf
    • https://uploads.strikinglycdn.com/files/b1a419ce-f887-46ba-b209-803cdd6781cd/how_to_reset_clicker_garage_door_keypad_without_enter_button.pdf
    • https://uploads.strikinglycdn.com/files/b608632d-3413-4a88-bab1-32b00c1ad93e/72395787616.pdf
    • https://uploads.strikinglycdn.com/files/c619a90f-1c7d-47ce-8fa7-a81482e2c376/no_free_songs_on_just_dance_now.pdf
    • https://uploads.strikinglycdn.com/files/3e57d389-cf31-4715-ade2-8386aa6796e4/dr_seuss_books_collection_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/1a841998-57ad-4af8-8d6c-6bee55bf4386/bose_sounddock_3_bluetooth.pdf
    • https://uploads.strikinglycdn.com/files/17afab1f-678f-4bed-891f-01931277d2cf/digugirunojez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb75.bin
ae4f5bd5f8a0ac5a8cd723ce679329102ddd02c63f8c030092151eda6dce34d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 5360 bytes
font_01_sfnt_off0000fdb4.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 1800 bytes
font_02_sfnt_off00010642.bin
1971394465e067c75debcf8dba3d9ad6d0682ca8cc048b8020a0cfd858b35fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10944 bytes

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