Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e7b156e062c08c…

MALICIOUS

PDF

81.0 KB Created: 2021-03-08 08:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1d061461eeaa300d83099c145b35d57c SHA-1: 5c67d574cd27187926e162eb46163e982c8f3972 SHA-256: 47e7b156e062c08c3a6dcc7bd4c6d53cfc64b9e74dbafa47b8085c25aeb05fd6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links to external websites, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as Pdf.Phishing.Trojan. The presence of external URIs suggests an attempt to redirect users to potentially malicious content or phishing pages, disguised by the document's apparent theme of cooking instructions.

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 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://nipisod.ru/strik?utm_term=signature+select+hickory+smoked+spiral+sliced+ham+cooking+instructions PDF link annotation
    • http://true-board1.club/89871180505gbbtn.pdfIn PDF document text
    • http://kpovli.ru/6164491389913xvp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd3a4823b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_60187a8551f8c.pdfIn PDF document text
    • https://nerisowale.weebly.com/uploads/1/3/1/4/131412290/4075955.pdfIn PDF document text
    • http://espaceabonnes.com/nautical_almanac_2019sa4ep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ffb1fb7556c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5fde884743ab4.pdfIn PDF document text
    • http://copyrighthelpcentral.com/bilal_ibn_rabahs9pn0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_60081dec89c0a.pdfIn PDF document text
    • https://sunowakodi.weebly.com/uploads/1/3/2/8/132814938/3771892.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/mepubelesoxogozotub.pdfIn PDF document text
    • http://magicwoolshop.com/683533871732bsx3.pdfIn PDF document text
    • https://vidamizumowi.weebly.com/uploads/1/3/4/5/134598026/52ad0efb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_ec2c88f7c99f4866893f62548d913413.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 5756 bytes
SHA-256: 53893cd056e4bf3ea41e5d597517cb3f03b9ade3e58390f34abd47bd825816ce
font_02_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 11088 bytes
SHA-256: e5a29ecdf2cdc257e57970e4a2ab87624904f12a79db4af686a323f30cf5d794

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