Malicious PDF — malware analysis report

Static analysis result for SHA-256 144429aeca14e88f…

MALICIOUS

PDF

80.8 KB Created: 2021-04-04 06:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0108475d86ff9b6aab5721c14580a5f0 SHA-1: 66e4d674ee7d05a6d0cbb505d971f02d369b1dbe SHA-256: 144429aeca14e88fde022d8f0de0e7b16d78aef1d6091d18b4f7873ed192d5e2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/wix?keyword=super+smash+flash+2+unblocked+66 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379974/normal_603778d8cecb8.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/3124711.pdfIn PDF document text
    • https://melesanej.weebly.com/uploads/1/3/1/1/131163783/4b7943b.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/caso_clinico_cirrosis_hepatica.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/certificacion_senasica.pdfIn PDF document text
    • https://cdn.sqhk.co/rezalabobo/ghyidib/tron_lightcycle_power_run_layout.pdfIn PDF document text
    • https://nobametu.weebly.com/uploads/1/3/2/7/132740930/mokazifobazava_patitoterizigez.pdfIn PDF document text
    • https://jurejiburinivu.weebly.com/uploads/1/3/2/8/132814500/lekegexesivex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_6036f75ee9ce3.pdfIn PDF document text
    • https://nugukofijopi.weebly.com/uploads/1/3/2/7/132712180/bajaruje-xuzalu-fegijalan-lewerajilot.pdfIn PDF document text
    • https://sixewamunid.weebly.com/uploads/1/3/4/4/134472099/biketogokorivetivopa.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/hhh2gd8/gun_strike_ops_ww2_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_602f7d8ddedf0.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/giJKqwZ/pocket_academy_zero_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_60229b27eb14b.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/1650979.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/6351428.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebenubes.onlinewebshop.net/fanaxezajomarapebixuzax.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_9ed7ebfe41ce4f07bf5ec79f762078c6.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_97803c0c494945dc9924d941b0f9fdbf.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_c9c3fb34a45b495485d067ea3d93698d.pdf?index=trueIn PDF document text
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_9ca603bc7a2344d7b3c19a2b54a34d7c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 5988 bytes
SHA-256: d8a6082f6c706782ca26e253db70278a5340e133a1ee44c467b890eeb296631a
font_01_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 11004 bytes
SHA-256: fec89def4fe2fb3239189dd0efd943bdbf8944c157c0782a4daf90be62880979