Malicious PDF — malware analysis report

Static analysis result for SHA-256 5513eb9baedbcedf…

MALICIOUS

PDF

76.5 KB Created: 2021-05-29 13:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b27e7a2913e6637855523f909a92098e SHA-1: 29f0758c6e645808c281ceb8aec7cc9a175d6337 SHA-256: 5513eb9baedbcedf13cd56497a5a4bc96ce15af932a750f6d8a9392a666c9f60
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://druttle.ru/123?utm_term=avira+antivirus++free+full+version+2018 PDF link annotation
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/jiluwefekap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_60537ba3ba6aa.pdfIn PDF document text
    • https://zivumipit.weebly.com/uploads/1/3/4/3/134317334/nivel_togopiginepi_xajupedufosi_jekegebufen.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/zikan.pdfIn PDF document text
    • https://tifitafi.weebly.com/uploads/1/3/4/3/134390202/xajadodanedide.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/644769.pdfIn PDF document text
    • https://sorimuzumetig.weebly.com/uploads/1/3/4/5/134519591/79f0524ff712bb8.pdfIn PDF document text
    • https://sudujosapo.weebly.com/uploads/1/3/4/5/134510416/6190978.pdfIn PDF document text
    • https://bizexolarosazar.weebly.com/uploads/1/3/4/8/134882522/9481389.pdfIn PDF document text
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/fasagamuwoje.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/852378.pdfIn PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/tazabera-doruge-borimaluxo.pdfIn PDF document text
    • https://kupezomevul.weebly.com/uploads/1/3/1/1/131164546/95926ca669b446b.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/kufivenidamateb-fabozelejafofog-sefoxaxotege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fda2d9fe0bff.pdfIn PDF document text
    • https://fizetisiwukuz.weebly.com/uploads/1/3/4/3/134339589/kawolepuni.pdfIn PDF document text
    • https://buvowanux.weebly.com/uploads/1/3/4/6/134685119/zivasujav_fulalejonosit_zuvemate_vexuda.pdfIn PDF document text
    • https://vitiwujujoter.weebly.com/uploads/1/3/4/6/134659282/toseru.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/talome_kawepamomirurij_takedol_sijirud.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_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5332 bytes
SHA-256: 5ad7fbbde502f9a682b40d6f31cd5e85ed02f74dbf2bdf865ab3c3e1e1250ce4
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 10960 bytes
SHA-256: 54303f4ff8f94016e5f063bbb1353da6be85587a1c6dbeb1d22fded1b60aa95e

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