Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac830c4d0f94bb9…

MALICIOUS

PDF

83.0 KB Created: 2021-04-06 19:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 321cc3306267298deef8209b56f16a8c SHA-1: b9a701cedb8cfbcff9ad8cd4c3c3135bec56a578 SHA-256: 9ac830c4d0f94bb9657da4cebe5cf70fea84d13f36f17a075fa17e6b9e359f06
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a significant number pointing to disposable hosting and employing UTM parameters, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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=sample+behavior+plan+for+autistic+student PDF link annotation
    • http://jodebisap.22web.org/acer_chromebook_11_cb3-_111_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5fdcc57b34174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_602d87a809da5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5ff5ae46c2711.pdfIn PDF document text
    • http://davavemoj.66ghz.com/fawaf.pdfIn PDF document text
    • http://ryukzak.digital/lotafagoketebadupedebubax26d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_5fd671a584be1.pdfIn PDF document text
    • http://fudidudigas.iblogger.org/xituvef.pdfIn PDF document text
    • http://verification-help.business/fegisolozesaxakikurab3ndi.pdfIn PDF document text
    • http://rigametovezo.22web.org/vanux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_6041e5bce1e2c.pdfIn PDF document text
    • http://xifizajutebov.22web.org/tixep.pdfIn PDF document text
    • http://domainlimax.xyz/573985519568x6h3.pdfIn PDF document text
    • http://fortuneo.biz/2004_honda_odyssey_transmission_shifting_problems5n6lp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_601a83bf48e16.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/moludowikarubesupogeg.pdfIn PDF document text
    • http://openchambre.xyz/biografia_de_alejandro_magnonjg07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8664ed-dc33-4628-ac84-93444f94b865/how_to_fix_lg_tv_screen_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1ef1f4-c49e-4881-94eb-5a12157e87bb/hot_spot_sorrento_spa_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d260a2c6-743f-493b-8bb5-97b381568542/what_is_curriculum_evaluation_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce1b925-9ca0-45c2-98db-9603f41710e1/48371358266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93742d92-23fa-474d-bad4-90cc0a8e3355/do_god_forgive_all_sins.pdfIn PDF document text
    • http://vurasoda.rf.gd/49207223109.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_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 5700 bytes
SHA-256: 43bc188052d25640a83120b53d19154d3737d81b6cdf0b97bb2a3e533f6b4663
font_01_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 10844 bytes
SHA-256: 757d28714a00d28e7a63e77f123e50cc60192f6fe67d90a4009fb548c40712d1

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