Malicious PDF — malware analysis report

Static analysis result for SHA-256 78462d7f0cdab637…

MALICIOUS

PDF

115.4 KB Created: 2021-05-29 14:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe8d072e9b7423ee26c151aca3990597 SHA-1: 5619ac0a68e826459b2287c1b1c133890d33d03d SHA-256: 78462d7f0cdab63782ff061998d723ed8ae376942a26781d73a8b67cc2609e74
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://zajinet.ru/strik?utm_term=last+shelter+survival+best+fighter+formation, is flagged as unknown reputation and is likely the primary malicious destination. The file was also flagged by ClamAV as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=last+shelter+survival+best+fighter+formation
    • https://cdn-cms.f-static.net/uploads/4483589/normal_605b7ccdf171f.pdf
    • https://cdn-cms.f-static.net/uploads/4389107/normal_603b6e62272d9.pdf
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/vubowir-debubijeko-vigoleti-remebimifobeja.pdf
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/vapiwazifez.pdf
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/xaxujugik-mitaze-navif.pdf
    • https://static.s123-cdn-static-d.com/uploads/4444114/normal_60b0015e17270.pdf
    • https://cdn-cms.f-static.net/uploads/4423427/normal_5fdc70136eeb5.pdf
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/7296656.pdf
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fe55543d985b.pdf
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/fovineno.pdf
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/9b533b.pdf
    • https://virikewujolitof.weebly.com/uploads/1/3/2/7/132712461/14ed923d550.pdf
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5febe894012ae.pdf
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5fc6426b12344.pdf
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/xogibeli-figamiw.pdf
    • https://cdn-cms.f-static.net/uploads/4483839/normal_604a7a86cbafb.pdf
    • https://cdn-cms.f-static.net/uploads/4450354/normal_6040d796a9328.pdf
    • https://static.s123-cdn-static.com/uploads/4420018/normal_5fec7cd00309e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8a35e915-9f1d-4ddd-b51f-8839515cf7d3/5485707660.pdf
    • https://uploads.strikinglycdn.com/files/7480b537-1926-43e1-869a-a054af357f67/4773164156.pdf
    • https://uploads.strikinglycdn.com/files/d6460369-36a9-46c9-a371-bc27da75fca0/simple_interest_word_problems_worksheet_doc.pdf
    • https://uploads.strikinglycdn.com/files/52d88155-97e4-475f-9cc7-04acabf3dea3/vorijaladosigefujid.pdf
    • https://uploads.strikinglycdn.com/files/e51d65c9-eb65-42c0-bc5b-93e18b9af45c/europa_baby_palisades_crib_assembly_instructions.pdf
    • https://uploads.strikinglycdn.com/files/0699afcf-e283-4e56-a910-54ec10f552ca/kexanaligozutojikoputar.pdf
    • https://uploads.strikinglycdn.com/files/171ee4c5-17f3-4bf5-9654-39794a8f5a2c/formulas_de_geometria_analitica_conicas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001785d.bin
e492e3e4c2173677f4fe56f45cf6b0a0d8038259cdb9af2e9e0a3b6146602a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x1785D 5204 bytes
font_01_sfnt_off000189ee.bin
d11b8be46f8ff0c1f3612a3f9a917bb34a004eaf1765494f543eabea33265148
pdf-font-stream PDF embedded font (sfnt) at offset 0x189EE 11552 bytes
font_02_sfnt_off0001b141.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B141 4324 bytes