Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0153fd78c26789…

MALICIOUS

PDF

76.5 KB Created: 2021-03-05 13:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1d13caef70254fc48fef63868cb8df84 SHA-1: 4cddd154adf3aad1a5dcd29ed9c39581a1c7eebf SHA-256: 8f0153fd78c267898b875b6b06db7b14a5a0955ec0e19f2945ce693db211027d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains an embedded URL that redirects to a domain associated with malicious activity, disguised as a search result. The presence of external URIs and link farm characteristics suggests a phishing or redirection attempt.

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://baarspo.ru/strik?utm_term=how+to+set+time+on+timex+t1305+alarm+clock PDF link annotation
    • http://rivilidopu.medianewsonline.com/dell_vostro_1500_drivers.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/how_long_does_it_take_to_become_a_trustee_in_jail.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5fd37d4e2b6a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370092/normal_5feb284168040.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/55690350093.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/8813080.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/biwibijajugiwisi.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/6111333703.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/28917051320.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/linivogimosufulew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fff0ac4cfbab.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/95612337907.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/fa1ed504-00e4-43c9-805e-cd8512c7c4bb/96880701729.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/matemtica_financiera_inters_simple_ejercicios_resueltos.pdfIn PDF document text
    • http://pigutun.myartsonline.com/82961001202.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/71316343054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a5bcd7-6146-40ed-b84a-46432f187489/cuanto_es_un_metro_cuadrado_en_pies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98865d53-b3ae-46d8-9acb-07358b49ad4e/zegulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d02c6b4-7f5d-4591-9217-eb7615e7e8b7/24464018209.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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 5612 bytes
SHA-256: 81f3e6ebb443c4fa1d62c7edffb9ed758702c34d1a94fdcdb74735da7629ec8f
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 11484 bytes
SHA-256: cea1cb09117a1dc3e929d470ceab6dc896a59c5daea9963e584d5138557971fc

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