Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb346becbb0acf8…

MALICIOUS

PDF

68.6 KB Created: 2021-03-17 03:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5fabff6b24d42e221980e06c16d26e0a SHA-1: b9bdb2d1f60942b45604cb6c7bcb6d0d1180940a SHA-256: feb346becbb0acf8210eb0e7a9eb9094986bfa64e2f19aa1fd905e2581dbbd17
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one, 'https://resalured.ru/award?keyword=cbc+lab+values+pdf', identified as a potential phishing or malware distribution point. The document body is heavily obfuscated, but the presence of external URIs and link farm characteristics suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=cbc+lab+values+pdf PDF link annotation
    • http://lukanovetefitef.22web.org/editing_documents_in_preview.pdfIn PDF document text
    • http://vnatural.space/does_netflix_have_kiki_delivery_servicezczx1.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/l8hjhd8/rankin_bass_jack_frost_dvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5fd81e2b6a8cd.pdfIn PDF document text
    • http://puwuditufu.22web.org/belewebagusuvijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372383/normal_5ff07cc5ef601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5fe936b72c40b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365607/normal_600015dde6888.pdfIn PDF document text
    • https://cdn.sqhk.co/vibifexode/QwMIhfc/caveman_chuck_adventure_all_bosses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_60207a6129ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5fd3bcddbbf1a.pdfIn PDF document text
    • http://graatorama.space/after_we_collided_sequel_release_datespfe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_600c91ec18759.pdfIn PDF document text
    • http://ranking-se.com/wobogibozagamenojruniv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jakibijujaxaxof.rf.gd/what_does_a_middle_school_class_president_do.pdfIn PDF document text
    • http://nokarox.rf.gd/cdl_self_certification_form_alabama.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_1c36f404bc8641f3be4cd3643a953981.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_cbad117d4c23435b9eaf41a92f8a7e36.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_6548ec4cc87944a890628fd575daef5a.pdf?index=trueIn PDF document text
    • http://wokolutomi.rf.gd/pufobe.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_d751cb2a4c0f4afab5012b72e1e0cd97.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_8f1c34e56da24a61b3f5682b99ddc6d5.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_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 5160 bytes
SHA-256: a68621d03b5fbc2285cab3d2f7b48b4234b69b5b53a14bc394d5b611e3aa57cd
font_01_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 10480 bytes
SHA-256: 5c85812568f5fec464c5b6686d89030ce23fd695921a3d6a84838db091f5644a

Open this report in the interactive analyzer, or submit your own file for analysis.