Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ca2a1682f4dd2f…

MALICIOUS

PDF

87.7 KB Created: 2021-03-02 07:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 231ae8af25ca91fcea0b5d32f2b6bb62 SHA-1: da84df6c480ce81ce67ba05b868a1e680fc4e1e8 SHA-256: 34ca2a1682f4dd2f3d33cb5dee6af3f7850c5a03f2d90e46946e070e083c769c
184 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links to disposable domains and the ML classifier output strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://yafferge.ru/strik?utm_term=is+cadmium+yellow+light+warm+or+cool In PDF document text
    • https://cdn.sqhk.co/pedidagow/aHjiIYU/ny_company_outlet_stores.pdfIn PDF document text
    • http://krokoboko3.xyz/26810708373w08ef.pdfIn PDF document text
    • http://xavimelobuvi.22web.org/do_katniss_and_peeta_live_in_catching_fire.pdfIn PDF document text
    • https://jipoditilab.weebly.com/uploads/1/3/1/4/131407274/5e8e96dda004.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/gazifawedusesibila.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/b8be985f661e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_600989ba1afed.pdfIn PDF document text
    • http://vivaxuza.iblogger.org/tozijilibatukij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6013195713453.pdfIn PDF document text
    • http://afracheat5.xyz/devizagf58uv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60130c487bbf1.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/jIhajiC/56394534392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416514/normal_5ff85d15d21e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deravamosu.rf.gd/chestionare_auto_drpciv.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16464 bytes
SHA-256: 29a3ccf0239c1e8a0407f8d4849c06a2d7fe3dcc18a7936a193a152727941c73
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 5484 bytes
SHA-256: aac3aa30e32c65a1a85f1c026e4a5974268a32110701df2aa6f6642db4e95841
font_02_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 10924 bytes
SHA-256: baf7f0c6e457befeb7f32d38cb619bfc07e59a5eacc119bfe345752959ef75e6

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