Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b180f98e5d47d9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 18:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 782e54d7d2f6ef469d019e5eacc6a4d8 SHA-1: 71064d5be78d55a4df071fc2b76fc0b8f441f00c SHA-256: 05b180f98e5d47d99555443b35498314cabe63b86660aaafd2da79bcbc96dc9d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, particularly the one pointing to 'kuzutuzo.ru', are likely part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=does+a+2006+honda+odyssey+have+a+transmission+filter
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/812ee.pdf
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3be2372b8.pdf
    • https://rokerisokexojud.weebly.com/uploads/1/3/0/7/130738924/powofiwibam_vojobosari.pdf
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/f8ab9.pdf
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/pezupol-vadezenotazogis-donezegopap-goziwufibofewu.pdf
    • https://rirokenu.weebly.com/uploads/1/3/5/3/135349909/lisipimoberikud-putuxuleb-medunebiziteb-deterelun.pdf
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd3226a9c593.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_a60fbbad38364e8f88510fdf43cc6921.pdf?index=true
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_1ede2093295945eea95de489f5142e14.pdf?index=true
    • https://s3.amazonaws.com/sobaketemu/zadalonuwana.pdf
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_fb8635153cdd48d296fd1966301c1042.pdf?index=true
    • https://uploads.strikinglycdn.com/files/782a3c8b-32a0-4250-92a8-c6ec4e26f873/luvosi.pdf
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_e4dc11b25915463992bbd7fd39bc0670.pdf?index=true
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_5c62bd315aa848c68a5e0ee3c4e86fd0.pdf?index=true
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_2b3317abd16b41c196f26ac4f9f468e5.pdf?index=true
    • https://s3.amazonaws.com/kegubinefuda/nafudagabovujeji.pdf
    • https://s3.amazonaws.com/gasodamuza/38130820835.pdf
    • https://uploads.strikinglycdn.com/files/8be6f9dd-7da1-43e5-8819-cc6aaae3b1f2/wonoj.pdf
    • https://s3.amazonaws.com/lanubili/pozizurilupemuvewuvi.pdf
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_926af6af4095435c98cf82941d8049e6.pdf?index=true
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_d337a08e6f9d4d55be63abc04e276523.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_off0000ef8b.bin
67544cafe58e869c805ac3aba83b9696611078834954a0b590ad48c72afca19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 5736 bytes
font_01_sfnt_off000102fd.bin
cadc55325447abec821d245410e79104f283dfc7bdb54e3a34dd91f0240f7d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 10320 bytes

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