Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34e1a1829d54181…

MALICIOUS

PDF

73.4 KB Created: 2021-03-04 02:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 48266db4a9ffc60a6b582356f282a655 SHA-1: 5174ac7c27d2f85ae8540e6edbaf22ca089d57d4 SHA-256: d34e1a1829d54181fc678188d5dfae0fcfcf231b6352e927203e9af7ad0565fa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed exploit stream and multiple external URIs, indicating an attempt to exploit vulnerabilities or redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body, though corrupted, suggests a lure related to IKEA assembly instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/wb?keyword=ikea%20expedit%20shelving%20unit%20assembly%20instructions PDF link annotation
    • http://usacreditreport.info/child_care_leave_formatzrj3n.pdfIn PDF document text
    • http://sifaritube.sportsontheweb.net/60050755138.pdfIn PDF document text
    • http://item-get.top/77893746790kxlqy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_601afe19d3196.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/89757453103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366047/normal_5ffb7e1516d5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5febf292c0290.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/can_you_vent_a_portable_air_conditioner_through_a_window_screen.pdfIn PDF document text
    • http://fb-ig-copyright.com/grumpy_cat_net_worth_2019xgfyi.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/present_perfect_vs_past_simple_exercises_elementary.pdfIn PDF document text
    • http://kismykeitio.best/icomania_icon_quiz_answers_level_24dip61.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/4392576.pdfIn PDF document text
    • https://bifuwesulowun.weebly.com/uploads/1/3/4/3/134308915/wamapegekufab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6022c4447c59b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 5856 bytes
SHA-256: 2fef593800d0de1d567a39bd39f6b8dc7acfcec85b5178d10d14f97932c735c5
font_01_sfnt_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 10732 bytes
SHA-256: c83897685df611cb11637392c54dd52c0652134804e5ae2d49addff4ecafaeef
font_02_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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