Malicious PDF — malware analysis report

Static analysis result for SHA-256 3872b5ece7c34eba…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 01:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9910cd3a8bb005a69639a7a70faedd33 SHA-1: 1b2ec018e8d5088a6900a9c30547eb6773297878 SHA-256: 3872b5ece7c34ebab4241ae092d11e8f7998825d0dc92981bf65fe5f645209e0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=why+socialism+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482027/normal_600ae4c9c923b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fcb2fcd0dfed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_605d42d7a6d49.pdfIn PDF document text
    • https://livozowenenebu.weebly.com/uploads/1/3/0/8/130874097/retesa_wiliwubeza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fcf49eae9429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5fe6c7b9828a6.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/tunaxu-gozaxe-gowiwotezuwo-lesez.pdfIn PDF document text
    • https://ridomepu.weebly.com/uploads/1/3/4/3/134305579/3663877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6012e0578b275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_6018f83e26197.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/80c0e2dd120d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_604685a0e76c3.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/ronisepedopuxar.pdfIn PDF document text
    • https://vojisijekedix.weebly.com/uploads/1/3/5/3/135311469/vafuvironut.pdfIn PDF document text
    • https://poturifipejo.weebly.com/uploads/1/3/4/7/134767967/6694555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368998/normal_5ff888f792396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6020fcc0e0443.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 5620 bytes
SHA-256: c29d6d9591a76c984b3073b62e5fadd26e5cf02c3a0124e5936068b351bf2e2e
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 11012 bytes
SHA-256: 526ca3e2d141e15c516e30267cc95e5a708dda10af0d95787da3d10e321f2044

Open this report in the interactive analyzer, or submit your own file for analysis.