Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54d92efeaec1d9f…

MALICIOUS

PDF

79.6 KB Created: 2021-03-23 19:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d3b9ea23793747fda8eb55fe9497bf4 SHA-1: 9f39ac8ca64e14ba365917a711e1abb3b245a1c0 SHA-256: d54d92efeaec1d9f86f88309adb3eb720e454cea8d5d033f9b26071ff3ba7154
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious domains. The primary attack pattern involves directing users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=what+is+the+central+idea+of+the+sonnet PDF link annotation
    • http://italysummer.space/takukovebojupexulat79gb.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/the_mortal_instruments_city_of_ashes_movie_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_601ef62989090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_5fdb1312c4474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_60094f98d34d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_604aab32b5973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_601c8e74a7a3a.pdfIn PDF document text
    • http://ewwe.space/7334079205944sm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6033380c1622a.pdfIn PDF document text
    • http://fitness-ital.fun/finger_labyrinthgzwl0.pdfIn PDF document text
    • http://sodahq.pro/virgo_and_cancer_friendship_yahoo_answersw8ibt.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/automatic_transmission_system_in_automobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_60143101bfce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_6052495932fa6.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/93cce677-ce4d-438c-bc4f-f3c53d68915c/calculo_integral_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e568f7-bde4-42d1-abc0-5003c0cae3b5/car_air_conditioning_leak_repair_cost_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefdd368-f83a-4abd-b406-8defaaff6499/xelexu.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/57983222398.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/gekikitapoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691c10ef-6120-46d8-9df0-2ae283a4af7c/28560594227.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_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 5124 bytes
SHA-256: 2b6ec03444c32986184ff0a1b10193960bc717723e06ec40091aea3a11aa30a5
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 10644 bytes
SHA-256: 3dd4b36cbefa0aa988b914e33903b5c39ac65d29b5ac7a40d9f70d61d254c912

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