Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48e39138d95c973…

MALICIOUS

PDF

133.5 KB Created: 2021-03-16 17:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 47c82bb66dce4e9f1db098f1e9ca9ab5 SHA-1: d46c8c645dd2f412604ff51a65aeb4a65eece2b4 SHA-256: d48e39138d95c973b8cd4a7541b8e405780d43d29f82d67571c36296adf491ab
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=android+studio+apk+app+not+installed In PDF document text
    • https://mifafuriladivu.weebly.com/uploads/1/3/4/7/134733471/f6348.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/805760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459654/normal_6037486270930.pdfIn PDF document text
    • https://mifeweravu.weebly.com/uploads/1/3/0/8/130874314/lorit.pdfIn PDF document text
    • https://matowesefuwuw.weebly.com/uploads/1/3/4/5/134592497/6cdb66d72.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/88829448666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5fdc00dc2c78d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368493/normal_6007c24c1e5ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/50_states_abbreviation.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/pacman_frog_care_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b6aec6-5d39-48ba-a6cb-188f709015ed/mufagusurupafebirupubevi.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/your_name_sheet_music_piano.pdfIn PDF document text
    • http://xilegep.epizy.com/46335336455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25861b73-65b9-4a1e-85d7-8cb0633a7b49/how_to_install_plugy_diablo_2_1.14d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45a965b-65d2-4425-8478-979872dd23ac/what_does_it_mean_when_all_your_dashboard_lights_come_on.pdfIn PDF document text
    • http://zarevarepi.epizy.com/8969220896.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/30120057642.pdfIn PDF document text
    • http://vurukovejetaz.epizy.com/wigetarawabugigufefireno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4698605f-3d83-4661-b66e-396483a25859/what_is_active_listening_in_call_center.pdfIn PDF document text
    • http://lelurofu.rf.gd/34373153131.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/avengers_hd_images.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D09E 5004 bytes
SHA-256: eb3a52245db6a0451cb5587b9c78ab7c6ffad8b290e42ad9fa3403b3300ac84b
font_01_sfnt_off0001e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1B2 11340 bytes
SHA-256: e37100447f26f039114421c27cd786f2184f7d841a4608e283e53c325cde7851