Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce4dd6206a3fa5d…

MALICIOUS

PDF

83.5 KB Created: 2021-01-22 16:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d7a6980a1d705ffbd18f3652bd41ac8e SHA-1: afa58fc4b1230a3bfd29e21dba87132d9de3daea SHA-256: 5ce4dd6206a3fa5d505a7ec9c0339bef9fe7ffefab3cd53cb35ad2245f0aa49a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=weaver+vs+picatinny+rail+dimensions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fc8e59b13563.pdfIn PDF document text
    • https://site-1177333.mozfiles.com/files/1177333/popsockets_diy_easy.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/8005f5f86.pdfIn PDF document text
    • https://site-1250438.mozfiles.com/files/1250438/46645445455.pdfIn PDF document text
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/0480002913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5ff2885a34e6d.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/bubebajinurizemi.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/mandel_browser_mod_apk_download.pdfIn PDF document text
    • https://site-1216747.mozfiles.com/files/1216747/vadifexilu.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/5928379.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/8989240.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/101411.pdfIn PDF document text
    • https://site-1174052.mozfiles.com/files/1174052/lewipoxilif.pdfIn PDF document text
    • https://fulewopopewu.weebly.com/uploads/1/3/5/3/135323857/fitogefobuzul.pdfIn PDF document text
    • https://site-1175554.mozfiles.com/files/1175554/jegipazajufezogut.pdfIn PDF document text
    • https://site-1172508.mozfiles.com/files/1172508/casanova_movie_parents_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 5396 bytes
SHA-256: 746f96f30493cbad00b68a85b8241eb6da5a5ef12f9cc96269367711c1665c8a
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 11796 bytes
SHA-256: 61707295ce8113689e2dd42d14c57d908561d7a458f73deb778d3fed2d0c8fec
font_02_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 6084 bytes
SHA-256: 0c3766dce408445f50e904d652c9326647873efe4fb22fffa238fb744f3c79a9

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