Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6e857e53451dd4…

MALICIOUS

PDF

136.3 KB Created: 2021-04-05 21:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c0a29fb2901c9c0e63d71228ca058161 SHA-1: 43a0990ebd69e466984dbe59ab6deca1541fc2d6 SHA-256: 8c6e857e53451dd4e671a591bbd4fdf4d110428896005ade5beae8438577c186
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The embedded content appears to be obfuscated, but the presence of numerous links points towards an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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=osteomyelitis+idsa+treatment+guidelines In PDF document text
    • http://puvepum.getenjoyment.net/dowry_system_essay_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/z0geIje/84178155615.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/heiiahc/cytus_2_miku_glitch.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
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_d44a3b89d0714ce7a2e06d56c3c7133d.pdf?index=trueIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_8ecfbdfb9b85455787cdc4be69a5eb32.pdf?index=trueIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/46071290007.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/igcse_chemistry_experiments.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_1e979f36421347889980683ad29a2ae3.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_e64dbaa912a94ef19a9f4a8c8cb2b919.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/46658290353.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/james_best_net_worth_at_death.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_9f3b22f508394ed5a5fd0fd9b42673e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/parikotuxuvobabijozadupep.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_6b536c5fabdc4c46bf1836cb3cfa2712.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_4cfcf8f35dd54e8a8bee13622070c458.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_48eb16b04d0f48d687e6711c47db26a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/86837478349.pdfIn PDF document text
    • http://suruliloxapesas.myartsonline.com/sudefapirorugagasefevu.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_off0001ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCAF 5156 bytes
SHA-256: 8559e984e9e71816b9ea49ddc8f0146b2eaeed44fcbf955ee18a47a7ee56fc34
font_01_sfnt_off0001de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE1F 11480 bytes
SHA-256: d90730c213a7747541cf9030370857ae7555f3e111dd60f0d1d712ce163e878f
font_02_sfnt_off00020534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20534 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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