Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8fc5d19434840e…

MALICIOUS

PDF

78.6 KB Created: 2021-02-19 01:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 04860c6a601c329888b144d2cbf8be96 SHA-1: c94721c7856c7bf28b4f92c206c6e5c4bff4c7fc SHA-256: cd8fc5d19434840e84bf729383c55e3ba4b288c26e062616ea569978766d88d8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a significant number of external links, many pointing to disposable domains or Weebly-hosted PDFs, indicative of a link farm or SEO manipulation tactic. One embedded URL, 'https://bologen.ru/wix?keyword=romuniverse+wii+wads', suggests a potential lure or tracking mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest an attempt to redirect users to potentially harmful content or phishing sites.

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://bologen.ru/wix?keyword=romuniverse+wii+wads PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fded61cea5cb.pdfIn PDF document text
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/6546465.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/bemumuwasakafo.pdfIn PDF document text
    • https://pefuwopiluja.weebly.com/uploads/1/3/4/5/134592541/bakofetugarutadi.pdfIn PDF document text
    • http://pearhaidhr.fun/11120782663m8uhb.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/3518588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422386/normal_5fcf7ceb5cec8.pdfIn PDF document text
    • http://tcerkovniekupola.space/maternity_maxi_dress_next_day_deliveryoz6gw.pdfIn PDF document text
    • http://6gusevshop.space/1168638740389jj7.pdfIn PDF document text
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/594015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zunewidimem/havana_euphonium_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/adobe_photoshop_touch_apk_mirror.pdfIn PDF document text
    • http://bagofawinigadeg.epizy.com/11050327986.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/dcfs_mandated_reporter_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/best_antivirus_for_laptop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 4900 bytes
SHA-256: 9076135d58dd585378865832c8cbcc8870a76df10df2b22499906c7afa9a367f
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10688 bytes
SHA-256: bd4c2f337e753e00d4893dc340a9ab2cbb9c67d9ad704f07a54066f540631eee
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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