Malicious PDF — malware analysis report

Static analysis result for SHA-256 439ea34940b2f10b…

MALICIOUS

PDF

85.6 KB Created: 2021-03-02 17:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ede06c0fa081cc6725b7b27608ca15cf SHA-1: 5e0d5c5ce8ce26cd72eef4879e8ccdee56c178d9 SHA-256: 439ea34940b2f10baefb33dfffe345c050508de04deb383893bcd84ce1793ce5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a payload by masquerading as a firmware update. No scripts were extracted, but the PDF structure and external links are indicative of a malicious download lure.

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://resalured.ru/award?keyword=tc+helicon+voicelive+2+firmware+update PDF link annotation
    • http://intereriia.com/rutalexijimixefuokasg.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/33090319993.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/xukulik-jaxibozedapakij-mumum-tugove.pdfIn PDF document text
    • http://apelsins.space/36143982959x0i5z.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/kikowadetejupa.pdfIn PDF document text
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/nerifasodojo.pdfIn PDF document text
    • http://sezituza.66ghz.com/62233402181.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/eiiKhiT/20971419013.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/9b4590b.pdfIn PDF document text
    • http://vbnmcxz.xyz/iomega_storcenter_ix2_setup_urlq11b9.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/gwpjh9N/xawekudipoxudumodinobu.pdfIn PDF document text
    • http://kenimenujaru.iblogger.org/excel_reference_sheet_name_in_macro.pdfIn PDF document text
    • http://qrastenmap.online/brave_2012_full_movie_in_tamilxbge4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/son_lois_lowry_review.pdfIn PDF document text
    • http://gexijefepawu.epizy.com/binary_options_trading_platforms_usa.pdfIn PDF document text
    • http://dazidotidipo.rf.gd/community_development_theories_in_social_work.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_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 5452 bytes
SHA-256: e162f903f073df01d15a593d5477af2a64e02d94ced40730acd5985979bf1a0f
font_01_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 10708 bytes
SHA-256: 1fb8285d84894eeb8961cd3640413b50c471edf4ce72d26574d491c3aab6a9fd

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