Malicious PDF — malware analysis report

Static analysis result for SHA-256 09541f1551cdedae…

MALICIOUS

PDF

82.2 KB Created: 2021-02-04 15:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5d5498dc5526c08f7c2cca3067a8344c SHA-1: 3f45f3fc18722458323ad8ba881918a4bf29a397 SHA-256: 09541f1551cdedae98dccb008620132bef3fb3d1024f601e419cbe894f059d99
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous external links, identified as a link farm and potential phishing lure. The document body, though heavily obfuscated, contains references to 'Spiderman wallpaper' and application metadata, suggesting a pretext for directing users to malicious sites. The presence of multiple external URLs, including those hosted on Weebly and other platforms, indicates an attempt to distribute or redirect to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=spiderman+wallpaper+for+android+phone PDF link annotation
    • https://jolesebadula.weebly.com/uploads/1/3/0/7/130740242/c269c06ea519ba.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/1xhjWgh/905755565.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijujes/pp8Q1hb/44809454477.pdfIn PDF document text
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/37e4bbe45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_6013a086afd0f.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/5393139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421476/normal_5fe4d3e17af74.pdfIn PDF document text
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/resajuwo-tojamilul-nitudu-gopelebixaw.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/bokelur/34335973766.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/99874165812.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/xedovi.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/guided_barbel_fishing_on_the_wye.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/56758367610.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_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 5296 bytes
SHA-256: 18af0d6782d8391f5bf44767b97913085fcaefeaad56f901dc5953c912dd28c1
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 11284 bytes
SHA-256: 922f1569839ebf6711389516929eaf22df37a99f3ef19261e01a17b9de44c0a8

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