Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70cdf0e34791284…

MALICIOUS

PDF

94.1 KB Created: 2021-03-15 16:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5af3e83ac17d7075aa73e4774ea2b0c6 SHA-1: 69e9abb6ee7de9bc3230a26ee6a7943ee6bab5eb SHA-256: f70cdf0e347912843afa3a2d8b43c73f2b9ba0cf7d86f1067663d2d601257da6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious links suggests an attempt to phish or redirect users to malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=talk+talk+discography In PDF document text
    • https://cdn.sqhk.co/tufuboloruj/jdhdjdW/ruwiraxikozosulo.pdfIn PDF document text
    • http://bigpleasure.ru/what_do_all_early_civilizations_have_in_commonc0bbj.pdfIn PDF document text
    • http://nesobaka7.xyz/86712098194o7cty.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/dtPjggh/score_hero_hack_2019_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/LwU1jdT/14173807756.pdfIn PDF document text
    • http://vinnipoh.fun/bolasigevezusuriditxvxtu.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/komepedovuzejizujulubosi.pdfIn PDF document text
    • https://cdn.sqhk.co/lixabanitav/IDjcjc7/asteroid_flyby_october_2019.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/3848667035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_6001ebd9a5401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_601a3823151b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_603130aa434e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nimanexobubibub.onlinewebshop.net/la_esposa_que_ora_dia_1.pdfIn PDF document text
    • http://giruwixavitunav.epizy.com/2210550741.pdfIn PDF document text
    • http://konojutusaxevik.rf.gd/87524047336.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/a_raisin_in_the_sun_quotes_about_poverty.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/negotiable_instrument_act_1881_notes_in_hindi.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_b8fb40771fc84f7c9db27f4c15b2d12a.pdf?index=trueIn PDF document text
    • http://pulupalu.epizy.com/dollface_tv_show_parents_guide.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_8fe1b7efb0694c98a73f0504b6f285ef.pdf?index=trueIn PDF document text
    • http://suvumudupese.epizy.com/deedee_wills_guided_reading.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 5012 bytes
SHA-256: 5c81ef711c75734a5b7f33c4478d91892bfe027683db7f384a30819eb4784378
font_01_sfnt_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 11704 bytes
SHA-256: dbfdcb37134cb96282db453bdb566adf0b74551d4d0f3b5992b5fe762322cce2
font_02_sfnt_off00015d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D04 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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