Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2ccf7037bc5db2…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 09:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 98d76301ea85ad092494c75fa85bc30a SHA-1: 8cfcc1f064ecf703d3a56f58130c50c0701ddd3c SHA-256: 4a2ccf7037bc5db2e72633fb2206d86e2019a398077e05edda5655caa0308c42
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary URL, https://midufefew.ru/aws, is likely used to redirect users to malicious content.

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/aws?utm_term=what+are+the+five+yamas+of+yoga PDF link annotation
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/8924495.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/1f5f0a3a2588.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/62290138454.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/romeo_juliet_audio_songs_free_download.pdfIn PDF document text
    • https://nulaxevaximuji.weebly.com/uploads/1/3/0/7/130776814/zevebojupit.pdfIn PDF document text
    • https://lotinusola.weebly.com/uploads/1/3/4/3/134321880/befubabukujavu_memewugax_burimotun.pdfIn PDF document text
    • http://golosa-spasibo.ru/85437456001hxztx.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/what_is_william_goldings_philosophy_of_human_nature.pdfIn PDF document text
    • http://penageli.getenjoyment.net/starcraft_aluminum_boat_restoration.pdfIn PDF document text
    • http://hookup153.online/371194196kwrme.pdfIn PDF document text
    • http://smirno.life/5120864191m0lmo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/86417287116.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/inspector_general_report_fox_news.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/our_god_reigns_chords_israel_houghton.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/73814129775.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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 5324 bytes
SHA-256: 18d7937ffc539a89ee1515a9e799d94efd298258f944f92c8d8b75f4f5497b98
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 10500 bytes
SHA-256: 3c1f5d9e3d0c402951454fa66d28f659c49d3f2f36149b3beba961e79fed91b7

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