Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe99fdb7b391371f…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 20:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b11ce0fbd30ceabe938275a189dd1e3 SHA-1: 347f15b8d2eadf9ee7d8a1338e01e74c14643183 SHA-256: fe99fdb7b391371f6afceea18616819e99c86f43da11a81919499185893b1d76
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://kuzutuzo.ru/wix?keyword=crosley+washing+machine+lid+switch', suggesting a lure related to product searches. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious or spam content, likely as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=crosley+washing+machine+lid+switch
    • http://nipijapogila.sportsontheweb.net/68644162986.pdf
    • http://jogemijafiw.22web.org/sample_answer_to_complaint_federal_court_california.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubatebedoxez/sosusotojokopiweju.pdf
    • https://s3.amazonaws.com/lebejos/baby_doll_new_sambalpuri_song.pdf
    • https://s3.amazonaws.com/dewazewokib/vuteziwevadeguzekowa.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/casio_g-shock_gaw-100b-1aer_multiband_6_tough_solar.pdf
    • https://s3.amazonaws.com/mejawiwomak/18661570356.pdf
    • https://s3.amazonaws.com/libusamagowuvo/nj_driver_license_knowledge_test_sample.pdf
    • https://s3.amazonaws.com/vuxirefare/zoxefoxukejakimuziwim.pdf
    • https://s3.amazonaws.com/bezegoluzose/negative_effects_of_cyberbullying.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_0470ef7f95b74ba9a19f76cd174de55b.pdf?index=true
    • http://gupatevefojip.myartsonline.com/jifamafugo.pdf
    • http://nogojituwizax.epizy.com/crinkleroot_s_guide_to_knowing_the_birds.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_f1729af3504242ac8cbd038c1f2d6c0a.pdf?index=true
    • http://rowezezivifa.epizy.com/sound_and_sense_audiobook.pdf
    • https://s3.amazonaws.com/janodojivi/94891490955.pdf
    • https://s3.amazonaws.com/mubefula/73240309098.pdf
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_22ff371f4c134f82860931e14f45f30a.pdf?index=true
    • https://s3.amazonaws.com/fizufapu/noxuri.pdf
    • https://s3.amazonaws.com/nasitevu/honeywell_vista_20se_programming_manual.pdf
    • http://jopuzasoxu.rf.gd/ask_the_dust_book_review.pdf
    • https://s3.amazonaws.com/risalenefazozo/clip_india_video_song_for_whatsapp.pdf
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_202c78a3ce27453998517f701a3c040d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed3.bin
e54af5d8602ef5b29b896b30b79c0a8b16ecded0d7aa00436a27513849afd4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 5452 bytes
font_01_sfnt_off00010144.bin
5c430d8833d94b66f708e589882dbe4e2d3aa6ffbc2a4f5b490257016969dbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 11700 bytes

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