Malicious PDF — malware analysis report

Static analysis result for SHA-256 056bb90f2e9efeac…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 01:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 032549988fc93289ceb4cae3007e97ac SHA-1: 14204719a50246be4b98b04e46b8b297403a907f SHA-256: 056bb90f2e9efeac5e65c8f5f608b447f7be3d5cba548951c0fa1df6ecbd49f8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The 'Payroll system proposal pdf' text in the document body, combined with the external URLs, indicates a lure to external content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=payroll+system+proposal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387929/normal_600bc5250a15f.pdfIn PDF document text
    • https://cdn.sqhk.co/dovinokobez/aA44hiL/zoho_social_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/geVhcX4/kigusamaliditawuxitati.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/gjjfige/iss_live_hd_earth_viewing_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/4hYTtJE/contract_killer_2_mod_apk_obb_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fe46c8f7f95c.pdfIn PDF document text
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/cdfbd883e99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fec45ffd28eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_5febb04973fef.pdfIn PDF document text
    • https://nutofagefisamav.weebly.com/uploads/1/3/5/9/135992035/jiveloluk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471236/normal_5fe29ace08cd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowoxemaxevajo.epizy.com/inteligencia_emocional_daniel_goleman_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/what_is_the_price_of_sub_zero_fridge.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_2f189802f7f7467a8f26bd0c560a9ae9.pdf?index=trueIn PDF document text
    • http://wawutanow.epizy.com/android_disable_google_assistant_long_press.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/why_is_my_solar_inverter_not_working.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_6c1e249d90a740e58c32af3d491929bc.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_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 5288 bytes
SHA-256: 775e83db99ac4fe0917452bbdc3955bde27928a3f355f957b045a05ec22945be
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 11100 bytes
SHA-256: 830055133a20fce626a1b7547c2eefc16321b4896338ca54906bd847d5d0d1ab

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