Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd6a5524ffa1176…

MALICIOUS

PDF

80.2 KB Created: 2021-05-24 12:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d4e603a0d36bea44cde2d97a577917d SHA-1: f3ae43a246a3c6203e8f00cd646e7b9f6a5a394b SHA-256: 5bd6a5524ffa1176cd869d21b8849b1230c95c37357f7b4a22c267a75af70622
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=do+police+radio+apps+work PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5fcd3dbe7b019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_6043bcb1d242a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_606103364e501.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/gixisufakavom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465255/normal_6001d935411fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411483/normal_5ffe92c865ede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_6025abf6806a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366384/normal_5ff4072a5c18b.pdfIn PDF document text
    • https://sazejorewisiboj.weebly.com/uploads/1/3/4/4/134459615/puniteti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401983/normal_5fc7d69baf2ce.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/nilemexofomanabosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fec2203197a4.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/ruwepek-miferekakapokam-nibilijozet.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/lobivegujizilomazube.pdfIn PDF document text
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/loxenunosutagularaxi.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/gegagusukin_gisurig_lodupo_pokirigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_605f69fb6429e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fc954ee51c35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fc93e2ca5baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_5fd2c42d807c9.pdfIn PDF document text
    • https://voximarabot.weebly.com/uploads/1/3/1/3/131383255/sepaketoveneperakopu.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/gorajikunobixi/55745028655.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/luwojobuberovuxutur.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
    • 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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5220 bytes
SHA-256: 1474426b9d7abe6f32acda8812e66f1f464e887909d3ccb94b5b81e39f532a62
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10988 bytes
SHA-256: ccfcc3083e112612240e687f5fed19da9085054f12b7c44fa0ae64ff1b106134
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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