Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b0bd5c4f1aa12c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-08 08:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cc19b08e40d843daaa3ea54a883a9856 SHA-1: 35de74d30cbfd5edc15b370446af8a5ebb1f0fcd SHA-256: 86b0bd5c4f1aa12cc9cf647abcb1ec6accef9178c625806e99b11a24eaa5c253
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_SEO_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=will+dr+sleep+be+on+netflix PDF link annotation
    • https://cdn.sqhk.co/gevagedubop/jaifgfF/figaratekuvamozonino.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/igcazxy/english_mp3_songs_free_download_isaimini.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/Ojdjj85/9625392834.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/jefegebajukifilij.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/hahajeo/41536829043.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/twilight_saga_new_moon_full_movie_in_hindi_download_mp4moviez.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/tapoketetomejel_suzawevonava_kuriduniw.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/new_free_wordpress_themes_2020.pdfIn PDF document text
    • https://lekinimogasujif.weebly.com/uploads/1/3/0/7/130739945/6839789.pdfIn PDF document text
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/towowusomoret_wonew_rodeje.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/Ijik8pD/manage_pulse_secure_client_versions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dagasopones/alzheimer_precoz.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_afbb826e4d5e4632b1618fb1380f2052.pdf?index=trueIn PDF document text
    • http://sofirenapirovo.rf.gd/46463549736.pdfIn PDF document text
    • http://zoniguzetixan.epizy.com/29898780019.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_69177f6209464433a3fbed8713184eef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/11951542622.pdfIn PDF document text
    • http://sunivope.rf.gd/28515379294.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/movapiko.pdfIn PDF document text
    • http://bexilonedatisud.epizy.com/ditojibenosotivivul.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_232954f8fa4745fbac98126d8476e716.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/mapa_baviera.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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5048 bytes
SHA-256: 9a69e478b9403a65184cf2cab2718f474e34eec8de53258df2810d4212879c0b
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10492 bytes
SHA-256: d74880a34e73d6df1b0100338ebe1c4473c9259459f66a1757f5148a65eda24c