Malicious PDF — malware analysis report

Static analysis result for SHA-256 035341db20cbd812…

MALICIOUS

PDF

77.2 KB Created: 2021-01-20 08:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 047e3281dc66adb7bfe828c8b95e58eb SHA-1: cca4bcc53f744fd30e85ee366ea585566f3393bd SHA-256: 035341db20cbd812a3eee83fa3ebe25fee607ab6b76c6c5f6ed73fa66e878a02
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to design templates. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/aws?utm_term=free+bifold+brochure+design+templates In PDF document text
    • http://rilotelexewobos.iblogger.org/52231165604.pdfIn PDF document text
    • https://site-1172340.mozfiles.com/files/1172340/stickman_shotgun_shooting_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/esGihha/44996986831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fdc9ac8b4b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378641/normal_5ff25169dc7de.pdfIn PDF document text
    • https://site-1174172.mozfiles.com/files/1174172/red_ball_1_volume_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5fb60864b323a.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://zinizebaki.epizy.com/first_blood_imdb_parents_guide.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/blaze_tv_channel_guide.pdfIn PDF document text
    • http://zikukoji.epizy.com/mibun.pdfIn PDF document text
    • http://duvexarido.epizy.com/jojov.pdfIn PDF document text
    • http://xetulugesoboko.epizy.com/94814001767.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/julamelan.pdfIn PDF document text
    • http://mopezit.epizy.com/employee_of_the_month_certificates_templates.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_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 5544 bytes
SHA-256: c4631872c60d83aa0f456f05fb5a803708c0b2efc6ed3688a89eb0c69ca416b5
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 10044 bytes
SHA-256: 248789ad3f623e579938cb0d9785a9d7d3d8d47fd2db2289723a7d42d25ed17c
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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