Malicious PDF — malware analysis report

Static analysis result for SHA-256 50631db1f8e942f5…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 06:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ef51408d5c228d2b6405f563a30122b5 SHA-1: 16e1ef58f737d2b3d5f210b23d405e8b8c4c69fd SHA-256: 50631db1f8e942f52da00eac6ebb77cea535f1c5c9a34be67be688b6594b7096
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL points to known malicious redirector infrastructure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests a pattern of using disposable hosting for a large number of links, likely to obscure the final malicious destination. No scripts were extracted from this sample.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=stand+by+me+stand+by+you+hiraidai+lyrics+english+translation In PDF document text
    • http://zanovekolasin.mywebcommunity.org/how_to_use_the_polder_thermometer.pdfIn PDF document text
    • https://gakubuzavesow.weebly.com/uploads/1/3/0/8/130813888/2659542.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/bissell_proheat_12_amps_troubleshooting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_6018e90082092.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/336747221.pdfIn PDF document text
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/putemaj-zosew-nexewafoxi-fofabinisox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_602b7b6050d85.pdfIn PDF document text
    • http://hookup681.site/92739607718uqr16.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/tinanegulivelezifejoma.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/retuzopipizijinutojobaj.pdfIn PDF document text
    • http://my-favshoph.online/kalutawegelubebidatejajywuxt.pdfIn PDF document text
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/910c4ce3e4ca.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/zujefotakezokinaz.pdfIn PDF document text
    • https://mutoxikaxinabab.weebly.com/uploads/1/3/4/8/134886861/dijulupigaxilotufi.pdfIn PDF document text
    • http://natiral.space/11197809740dw7z3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5fe561fa9ff8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/meniwiwuxuwalolo.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/23990354897.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/sonaveriminorizo.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_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 5696 bytes
SHA-256: fefc6e95bee08a89325a3d5932383e3ad5ee0201f2a394f73fe1ca945aa6510a
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 9940 bytes
SHA-256: 4d4182f19608dbea1cc636ebf404ac98c4208bdb9aea0125c39b6ec2f21f6818

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