Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85970f23ce2a56a…

MALICIOUS

PDF

69.8 KB Created: 2021-01-27 11:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dddf1c09b76f1679806cd8494afe41e7 SHA-1: 5e3b2ef0b202dd4334f7e82316b9604cd50cc0e9 SHA-256: d85970f23ce2a56aa0f95e13bbf6969221a744ffece75cb44c1b9efecb3e1f18
244 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary link directs to a redirector URL that uses a movie-related keyword, suggesting a lure to disguise malicious activity. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/wb?keyword=gravity%20movie%20ending%20after%20credits In PDF document text
    • https://morexenuf.weebly.com/uploads/1/3/5/3/135311883/luvarowawoderojojewa.pdfIn PDF document text
    • https://letanidopubiza.weebly.com/uploads/1/3/0/7/130775959/risugodar-sedewopobe.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/gebolubono.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/5bb78b707a.pdfIn PDF document text
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/tizatuf.pdfIn PDF document text
    • https://vuzitiruf.weebly.com/uploads/1/3/2/8/132814505/bb7e1.pdfIn PDF document text
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/pojineg.pdfIn PDF document text
    • http://sejapamuji.22web.org/gainor_staffing_timesheet.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/bozutiwevejatorel.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/sifamibifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xajowu/pubg_on_my_way_remix_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/wkhtmltopdf_page_breaks.pdfIn PDF document text
    • http://lavovexerok.epizy.com/aarum_kaanathe_aarodum_chollathe_song.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 5504 bytes
SHA-256: 3b109395247341672b066e0b1e872aff14122ddd104d717445010721d6d5e0d8
font_01_sfnt_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 10872 bytes
SHA-256: aeab56bacb3ca4f681b014c6da30c07a12c8fb71721b269f1e3dd6b975fd931e

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