Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d04386b86b1d195…

MALICIOUS

PDF

82.3 KB Created: 2021-03-08 18:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 08fe1bfa9d57eb0618510942d8dd5e45 SHA-1: b54d477606cfda23b2652798c3acf0c8b2c70c99 SHA-256: 1d04386b86b1d19509c5a4ddc6dc46cadc3e27d7028cc78354c5ba33070470a3
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://lozipotod.ru/123?utm_term=alt+balaji+new+series+free PDF link annotation
    • http://sibogufurab.medianewsonline.com/que_es_una_trombosis_hemorroidal_interna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fe9c4b6a6a53.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/hgdghro/fugejukolafeperi.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/1683871.pdfIn PDF document text
    • https://xokiguju.weebly.com/uploads/1/3/4/6/134679394/xemala.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/igWie1v/tetutafukalifot.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/gj2jjls/what_is_dengue_virus_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443821/normal_600109f6cb393.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/maxemapu.pdfIn PDF document text
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/denovaliduki_xidir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5fe8a2a66111c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fdc5058d7283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fc952c681953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://binuxusegewake.epizy.com/familysearch_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/labisajunedor.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/43352932735.pdfIn PDF document text
    • http://lemagokumir.epizy.com/qu_significa_soar_que_se_me_caen_todos_los_dientes.pdfIn PDF document text
    • http://gidepajujida.rf.gd/el_cancionero_de_petrarca.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/battery_tender_jr_red_and_green_light_blinking.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/jaroneg.pdfIn PDF document text
    • http://wupubobetob.epizy.com/curso_tecnico_tecnologia_da_informao_online_gratis.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/73906438414.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/41479551034.pdfIn PDF document text
    • http://tiwumuni.epizy.com/9490455231.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 5060 bytes
SHA-256: ed25172c513ac4370d4254e3fc748aa1c0c0dcc2187146b90d39967c8c3ffe76
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 11124 bytes
SHA-256: da1fe596395d8d6c6a61070831d56684cf5816ab03a9b8f31edd8f1b74a7ecde
font_02_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16336 bytes
SHA-256: 0308b7e45e533fc36ed14bb91612a819bec8fedd6a77b969bc726590389af327