Malicious PDF — malware analysis report

Static analysis result for SHA-256 19db777b4a49b48c…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 12:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98afbb749d4eb20dda638280fceb1d3a SHA-1: 795365a78e550d55f6d9ca6450b1ade7eef4edc1 SHA-256: 19db777b4a49b48c8fd231c6dc3d52d310ec6a99933d831b2c93271588e49eeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, pointing to various PDF files hosted on different domains. The primary URL, 'https://leonvi.ru/award?keyword=fur+elise+piano+pdf+easy', suggests a SEO-based lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. No scripts were extracted, but the structure strongly indicates a malicious redirection or content-serving scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=fur+elise+piano+pdf+easy
    • https://static.s123-cdn-static.com/uploads/4482405/normal_5fee1875a4bec.pdf
    • https://wajumasilikat.weebly.com/uploads/1/3/4/1/134109139/giradozuxusibo_babitixulij.pdf
    • http://drive4mclaneaustell.com/movomyevzl.pdf
    • https://static.s123-cdn-static.com/uploads/4366385/normal_5fee3937896a5.pdf
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/fiwojosaguvekafibuja.pdf
    • https://static.s123-cdn-static.com/uploads/4461202/normal_6005dce1dc8fc.pdf
    • http://lenudes.com/dialogos_sobre_fisica_atomicaff8lc.pdf
    • http://raftgjgr.space/2806024497eq681.pdf
    • https://cdn-cms.f-static.net/uploads/4381543/normal_606163541d198.pdf
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/poxetabufiwalad.pdf
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/zazimok.pdf
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/496df9a.pdf
    • https://wopixidotawus.weebly.com/uploads/1/3/4/5/134506387/buviziz.pdf
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff213efa5f58.pdf
    • http://my-favshop.online/386385499797z2hl.pdf
    • https://static.s123-cdn-static.com/uploads/4447087/normal_5ff20a84b332a.pdf
    • https://cdn-cms.f-static.net/uploads/4380384/normal_606242e01adb4.pdf
    • http://constructionhouse.info/xeroso824ef.pdf
    • https://cdn-cms.f-static.net/uploads/4419412/normal_6046db782c0e5.pdf
    • http://mp4.design/7345533344484kl8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50a.bin
aa8dd292df5a72dec98c3ae06d428e769cca6987bdc5690b48b2b678c84b3839		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 5092 bytes
font_01_sfnt_off0000f676.bin
ff74748a8d4d1b2791b99d4c2d9a1506002f674c7bf4030cdbff5669189f45c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 12056 bytes

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