Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae180bcb41f205b…

MALICIOUS

PDF

81.0 KB Created: 2021-04-07 00:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 066984abd3c37657a7dcb5c563359aa3 SHA-1: d6cbf2dd6ea2191847e0300b42dc607a09ac6ab4 SHA-256: eae180bcb41f205bea12216c46c84af1001e6852c4562deda146e7ea93081a46
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://nipisod.ru/strik?utm_term=honeywell+8000+commercial+thermostat+installation+manual PDF link annotation
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/zevulinokatifumagom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_600c51774e1cd.pdfIn PDF document text
    • http://esclub.pro/pitch_anything_summaryqwhlf.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/juzolumaxew-napiwidubere-luvalomakixup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_6063ac4a31ab1.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/17f98b403b265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_601a01d1af972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_6025e374d5f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_6069978e0c4d4.pdfIn PDF document text
    • http://shoop-fm.ru/how_to_setup_zebra_printer_zp450bgnho.pdfIn PDF document text
    • http://yesitalia.fun/calendario_2020u5ew7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_600453c4a68c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_6034ebf586831.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_2b12bdc8614a43878ad7d6667607b815.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a050110-4776-4808-8b50-54149d0c12b2/lg_50uh5500_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d9317d-05ce-4063-b852-15178999a0e1/72671346362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5b44d1-9944-43eb-a2c4-62e055f19eaf/43056264236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769942d7-7b15-4da3-a79e-67d647815b61/gta_v_codes_pc_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a09337e-7f4d-416a-968e-b9bc93f38f8a/80772964269.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_8bfb38b62bda4ff8949b01bdcc8d44f2.pdf?index=trueIn 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_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 5528 bytes
SHA-256: 1efb14030cbe0d26da3e8ef1edd976b4508071006ad32af3fa63aed5d972c262
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 11916 bytes
SHA-256: 56e99e00da92a6d44a9a25c1c59af90027c9882ec8ee6b1e47c3df7d6268f113