Malicious PDF — malware analysis report

Static analysis result for SHA-256 83915f15cdc7d85b…

MALICIOUS

PDF

67.7 KB Created: 2021-02-14 09:10:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e9dedd82b6a695eb8d3aeffa53982c60 SHA-1: 24596b3280fe42b0394cf6a642bbc087622fdf3f SHA-256: 83915f15cdc7d85b989f4e61d885a2d243b3f7f603b030c2dc13e55e6beb8560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to PDF files hosted on weebly.com subdomains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to contain metadata related to its generation, but no clear user-facing text.

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/wix?keyword=visual+phonics+chart PDF link annotation
    • https://netiwililisal.weebly.com/uploads/1/3/5/3/135398280/684766.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/2613341.pdfIn PDF document text
    • https://tijawuxegolizad.weebly.com/uploads/1/3/4/5/134597381/regudusonogeb-zinibojazural-selonarurogi-wawesozigobar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5fc8a4b09f0b7.pdfIn PDF document text
    • https://sadupomojafex.weebly.com/uploads/1/3/0/7/130776775/furowurusonixem_senumo_gogaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5fe78337e3366.pdfIn PDF document text
    • https://turudesufexo.weebly.com/uploads/1/3/4/1/134131379/6783028.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/penexidiv.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/c74f559.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/1010601.pdfIn PDF document text
    • https://lelorovosa.weebly.com/uploads/1/3/1/0/131071021/tupowabep.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/a8aa1b4f9b021e2.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/suxugipipolazog/tezenegax.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/fun_activities_worksheets_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/codashop_ml_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/paramore_riot_album_deviantart.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_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 4984 bytes
SHA-256: 5508dbab823c774e85f9939f0dd95e8bc0a2d62d5463193ac6716481a38a682e
font_01_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 10196 bytes
SHA-256: 7a583e83ddb90ec73a2fb5177515ba14809286017cb728c9cb9bf0a4a8fa14dc

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