Malicious PDF — malware analysis report

Static analysis result for SHA-256 b355c5baaa989d8f…

MALICIOUS

PDF

70.6 KB Created: 2021-02-14 12:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3e81c1cf2caa05c94f782459c9b1d9ff SHA-1: e34f7fd432d25f8fb7b58b212041d34164aaf8a4 SHA-256: b355c5baaa989d8f33986573edab5d71514c29fa8c888627707e31252451b5c5
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=lotus+symphony+sdn+bhd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fc8545ea5550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6014f89a7d231.pdfIn PDF document text
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/xegipoluxut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_601a9d8a1e32b.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/5968027.pdfIn PDF document text
    • https://fogufapepupol.weebly.com/uploads/1/3/1/8/131871477/bivavis-wusulaxuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5ff89e2cced7a.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/gifojuxaxeva/gosokixudorat.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/sipiburivuwusogarorumijix.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/cordless_phone_answering_machine_new.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/kompetencesekretariatet_team_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/jixekibenara.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/beginning_with_the_end_in_mind_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/swgoh_darth_revan_event_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/proactive_routing_protocols.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/11116977921.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/bangla_cid_new.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/solika.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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 5044 bytes
SHA-256: f225ea51114f9a91737aa70dbfff72fa2b8b9bab49ed89a34a1d64f612637672
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10844 bytes
SHA-256: b22ce8367311f8bd02286d6b0c63569d7b8aa481d19971a8559887f3aea6f6be

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