Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb2d565e0657e77…

MALICIOUS

PDF

79.2 KB Created: 2021-03-06 13:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ec95da23472a75dd0e9f39c2e1a6c1 SHA-1: dd2ac52c50e3029ab6d7a5471bf907f5a23ba435 SHA-256: 8fb2d565e0657e7776724c59d44e12a647beb74c6d3c839e9a8a4c71c4cbfd93
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier also strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/123?utm_term=is+jail+for+punishment+or+rehabilitation
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/wosivitewi_nevitikogip_talaji_sefakusal.pdf
    • https://ridoduna.weebly.com/uploads/1/3/4/5/134528127/dogukubo.pdf
    • https://numusebitekamun.weebly.com/uploads/1/3/4/8/134871234/mirewiwikalodexuju.pdf
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/bibotuditebewepivoj.pdf
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/1750c9.pdf
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/2000582.pdf
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/dudedowemumepafovanu.pdf
    • https://zizobisorodevu.weebly.com/uploads/1/3/5/9/135964877/kasijosagutemedoda.pdf
    • http://lizakoku.22web.org/performance_assessment_comments.pdf
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/5975456.pdf
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/2569721.pdf
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/webafibulob.pdf
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/3aa428879f39.pdf
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/1669132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://difiwawi.epizy.com/4666979017.pdf
    • http://kelukuve.epizy.com/bowflex_power_pro_xtl_power_rods.pdf
    • https://uploads.strikinglycdn.com/files/04a41686-6009-435e-bbcd-35e471d59882/carrier_furnace_heat_exchanger_warranty.pdf
    • https://uploads.strikinglycdn.com/files/d5ce8a9d-325d-4d0f-b5dd-4083782d4693/66798444704.pdf
    • http://rigetimidolofok.rf.gd/94099554729.pdf
    • http://besipopi.epizy.com/nazm_hikmet_yaamaya_dair_iiri_hangi_kitabnda.pdf
    • https://uploads.strikinglycdn.com/files/c2d84f6a-f27d-469b-989f-7fa45475cf01/what_is_knowledge_self-efficacy.pdf
    • http://resukiluzuw.epizy.com/dibup.pdf
    • http://mavoweba.epizy.com/cell_phone_answered_remotely.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f897.bin
31c1e8536aec26f1706c027bad23153b88636472ed0afa51eacf992101a1b9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 5296 bytes
font_01_sfnt_off00010a6c.bin
330f5da8eebe4344c6e5a885a633a966e57720b3df8173a6cf20443f066a18ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 10932 bytes

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