Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f9a56dd8be5ffc…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 06:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aacaf19ac68d4d3e8f3014f15d1f9360 SHA-1: 458b53d1681d47bf0f9ee74482910da92f59f60e SHA-256: 38f9a56dd8be5ffc645e8638d8a6ec55cfd1da10a7ed65cb1bd91319f36831fa
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'resalured.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting. No scripts were extracted, but the presence of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=sight+singing+for+beginners+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477137/normal_6004422f60dd5.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/fe1bf3157176a9.pdfIn PDF document text
    • https://maludanojuwido.weebly.com/uploads/1/3/4/5/134591959/pokuxile.pdfIn PDF document text
    • http://weraka.online/eia_scoping_report_examplekomht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_5fe99f45b6358.pdfIn PDF document text
    • https://nekawosewifij.weebly.com/uploads/1/3/2/8/132815774/wateraxirejefex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_601ce9736963e.pdfIn PDF document text
    • http://presentinsta.site/how_to_clean_a_keurig_mini_with_vinegar5mvwg.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/e4da8865520b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_60571ec15c553.pdfIn PDF document text
    • http://carinsusa.com/lineage_2_classic_fast_leveling_guideckle4.pdfIn PDF document text
    • http://fakts.design/zapudesesufodudamenevaxafvix9.pdfIn PDF document text
    • https://vozapevozatoka.weebly.com/uploads/1/3/4/0/134097066/c164300e4.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/levumoduf/archero_mod_apk_unlimited_money_only.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/dlink_dir_605l_router_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4291fb11-ecf4-499d-bbb3-24637257e2e1/do_norse_gods_still_exist.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/logifonomogiwuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/altaf_raja_song_song.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_6f4a51d5a7f841c19f6447092e7e6641.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/355514f1-fbc4-44f8-aa05-5a12acc45774/bilijabetodit.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/waltz_in_c_minor_chopin.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_417002f271a0454584204d5d8bfc9d33.pdf?index=trueIn 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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 5304 bytes
SHA-256: 45ae773b568c4e4b392bc40800e5452b8c3e77f64c3d8d580f03c284184cb505
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 11764 bytes
SHA-256: b5d875faf1417bf69dd4f0324fc2da30ff1ed07ba5d3bbf53003d635af1b0fb5

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