Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4f38e8e3c0cd2f…

MALICIOUS

PDF

79.2 KB Created: 2021-04-06 13:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da450612ad14b3446acd115b3e455e37 SHA-1: 572fb94786e6d0c9c5effe7c0af856b51a85b50f SHA-256: 9c4f38e8e3c0cd2fabc9b3c495f629147e4bbc94b0064059762b7fcb3c470506
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to lead the user away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=fluval+fx6+turtle+setup
    • http://kvyovk.xyz/9399659910mrbrf.pdf
    • http://bettyloustintruckbbq.com/subject_and_object_pronouns_worksheet_for_grade_2djaz4.pdf
    • https://cdn.sqhk.co/nedupugifuka/jjfgfgG/wojotowipojegirepik.pdf
    • http://datingdate.site/kedisimuvaxefuwoduxixqps3l.pdf
    • https://cdn.sqhk.co/pugipepa/iNjeHic/famadukesori.pdf
    • http://jetelijunejuk.iblogger.org/badger_meter_m_series_m2000_manual.pdf
    • https://cdn.sqhk.co/wazuvegox/iEjhFjc/ligovol.pdf
    • http://poopo.ru/fiweridiklwjwk.pdf
    • http://wellwork.site/19865620129t1x5x.pdf
    • https://cdn.sqhk.co/zapiferufefu/oYOUPTl/newajedetenovolexogugag.pdf
    • https://cdn.sqhk.co/fogunedevare/dgfhbhc/restaurant_story_2_mod_apk_2019.pdf
    • http://sell-toclick.online/nebafuwisarebagusa2kafp.pdf
    • http://zozilejumulis.22web.org/navy_recruiting_district_los_angeles_phone_number.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_dbb5289498a54e8ea36eefd148daeae2.pdf?index=true
    • https://s3.amazonaws.com/pezofut/korean_language_app_ios.pdf
    • http://ponowuvibux.epizy.com/teoria_del_aprendizaje_social.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_ae70b0319427417ca4e4a6153df5edf5.pdf?index=true
    • http://pubikuvudara.epizy.com/career_exploration_definition.pdf
    • https://s3.amazonaws.com/zarevizebi/8394479117.pdf
    • 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_off0000fbb6.bin
443a0ee60db43b8a5b7ce7cf21b5a509aa23f5dff6d644eb07067913ed181f32
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 5132 bytes
font_01_sfnt_off00010d4b.bin
db600e5595fdc1d0d2d68f21c0978b26fa9f9dd9fed51fb1ef561c3d0701ab88
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10172 bytes