Malicious PDF — malware analysis report

Static analysis result for SHA-256 735090f7b9c3e4c4…

MALICIOUS

PDF

86.0 KB Created: 2021-05-10 10:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53e666c1ea241314456d6e6daabb7d25 SHA-1: b5a0ca93c70cd1be2beb31fe423e5ade933efe83 SHA-256: 735090f7b9c3e4c498e8302d874ea999c92e8d2605176af71424a35ad9f7e7b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent link pointing to 'kuzutuzo.ru'. This URL is associated with a phishing or malware distribution attempt, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=intermatic+timer+not+working
    • http://juronesewuku.22web.org/5123379050.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fusidejebi/10241788080.pdf
    • https://uploads.strikinglycdn.com/files/00059ca3-5a02-4d87-aa0a-25402032d7e1/from_margin_to_center_bell_hooks.pdf
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_9ffc46bcdf4442fda94c52c0ca679bc9.pdf?index=true
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_61f224ac1dee4a5a9e614755ebf32351.pdf?index=true
    • https://s3.amazonaws.com/lezopobigeza/99286017314.pdf
    • https://s3.amazonaws.com/nazekisigiduz/easy_first_songs_to_learn_on_acoustic_guitar.pdf
    • http://raredinufewota.epizy.com/beginner_english_questions.pdf
    • https://s3.amazonaws.com/lanaladu/direpulamenujijafuvonuk.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_996a1fe4e0184983b2e981044f405a9b.pdf?index=true
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_f646fd8e45a54a75b4deb8e4d23fbedb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e732fffa-8482-4546-97fb-68575719933c/dragon_age_origins_mods_installieren.pdf
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_1c4213a2952445a98404cffd25fd2719.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4369c076-1bc7-445f-b2fd-aa9b12b23e4a/free_compare_and_contrast_examples.pdf
    • http://jixosakotipol.epizy.com/what_is_the_application_deadline_for_ucla.pdf
    • https://uploads.strikinglycdn.com/files/4769ce3c-e4e2-4119-ab8a-5d570ff8d493/naxisonidebozeji.pdf
    • http://lixovijegami.epizy.com/jufux.pdf
    • http://xegiseko.epizy.com/vaguzagiboxojuwafoj.pdf
    • https://s3.amazonaws.com/tarajix/71288542811.pdf
    • https://s3.amazonaws.com/jinotugiwomo/ziwavini.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_a263630bb7664edc8df56911e7d2eced.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38000e24-1805-42bc-a142-75b8fc4a1460/27859654693.pdf
    • https://s3.amazonaws.com/xozeb/libedulu.pdf
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_f72d573ed8fd42a4a8b8c44eed99c21d.pdf?index=true
    • 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_off0001044f.bin
cfee4e759e6167ad853799b12464875917b293a4c4bcc80c6fb8ec21a3d095ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 4788 bytes
font_01_sfnt_off00011481.bin
5eba235d27f9c2cfe50a41070151a4bf7ca0afeb9fe420d76926e1c3dd23ad85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 11644 bytes
font_02_sfnt_off00013bf7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 4324 bytes

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