Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b465f7426fd556…

MALICIOUS

PDF

73.4 KB Created: 2021-05-18 21:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f19ef1410110daac806328557a4ae9eb SHA-1: 2e53c7ffc1f6d5838e92e3450b7f817d18135a3f SHA-256: 50b465f7426fd556091b95e142b859020c1c4225a946fcd5895b6a359aa8ee57
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of embedded external links, with heuristics flagging it as a link farm, potentially for SEO manipulation or to direct users to phishing sites. The primary URL observed is https://nipisod.ru/strik?utm_term=libro+contabilidad+de+costos+ortega+perez+de+leon+pdf.

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=libro+contabilidad+de+costos+ortega+perez+de+leon+pdf PDF link annotation
    • https://jarovoxo.weebly.com/uploads/1/3/4/5/134511136/vafanitipezusepupetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_606cf1564cfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_6034d1fc77b6a.pdfIn PDF document text
    • http://wajolirivug.iblogger.org/xefovibujotajupisosoropib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_60326f5daf4d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_60192aac6ee62.pdfIn PDF document text
    • https://guwakeba.weebly.com/uploads/1/3/4/5/134597639/zolowop-gobos.pdfIn PDF document text
    • https://boxagotogod.weebly.com/uploads/1/3/4/4/134491964/1548665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_6029fb277c000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485149/normal_5ff00dfaec065.pdfIn PDF document text
    • https://dutedurelixuvu.weebly.com/uploads/1/3/4/3/134320021/lewigezudurezogo.pdfIn PDF document text
    • http://rulazix.iblogger.org/21894909343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunolipatebaw.rf.gd/what_is_url_for_google_search.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/t95x_android_tv_box_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/25457857057.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/apple_airport_time_machine_manual.pdfIn PDF document text
    • http://botuwosolu.rf.gd/95247801349.pdfIn PDF document text
    • http://kiluwemu.rf.gd/41292328680.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/free_lagu_waktu_yang_salah_cover.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 5452 bytes
SHA-256: 9abad03af07a9c0f91a98d11429ec0d074e969222793d03ec58fcb61f97413a2
font_01_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 12332 bytes
SHA-256: 544007e44cb22e8cc833b75f99cffa76810e9608be2fd59a12e6a0a2ffada276

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