Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17519d0e9a25e5b…

MALICIOUS

PDF

82.5 KB Created: 2021-02-26 08:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d1de7d18ee9aa4361c35b0bd55db5452 SHA-1: 1d5f8a0639140a1e1724a2392d116753bf3c482c SHA-256: c17519d0e9a25e5b8b585f779f59a29223b4063666ed35e440f329f869977600
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV. It contains a large number of external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=lg+inverter+direct+drive+washer+front+load+parts PDF link annotation
    • https://nepuxobim.weebly.com/uploads/1/3/5/3/135304691/5e911.pdfIn PDF document text
    • https://febovaze.weebly.com/uploads/1/3/4/1/134131302/cd85f013e311b.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/96e794a5c2.pdfIn PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/1969397.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/lufenetizalozag.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/dikof-xodevepix.pdfIn PDF document text
    • https://bubinaxe.weebly.com/uploads/1/3/2/6/132681619/negitejepeg-winufibekub-feritezajiza-gebeduxeziboxa.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/xuzamugiluravi_zisofuziriwol.pdfIn PDF document text
    • https://nalelijuw.weebly.com/uploads/1/3/4/5/134512153/2b32b08f3f917d9.pdfIn PDF document text
    • http://leledup.mypressonline.com/40534748286.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/vasedon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudupaxub.myartsonline.com/60068140642.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/84757855718.pdfIn PDF document text
    • http://perinuve.epizy.com/pawisetijotex.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/45425889346.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/7405990689.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/dolavisemujuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/rebagi.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/adobe_photoshop_7._0_hair_brushes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/63357974034.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_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 5512 bytes
SHA-256: 4ca705ac8790053a3fe3fa0e31d592dda121960bf581ccc97b03eba42519b1d2
font_01_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 10628 bytes
SHA-256: 81207f0c4a8d4327b6686f2e2eebd76639267ff97a176a8650c1c5e0c82da8de

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