Malicious PDF — malware analysis report

Static analysis result for SHA-256 1702a282871bf813…

MALICIOUS

PDF

76.3 KB Created: 2021-01-26 00:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77ae6b5678214845b5b1a8b4d98a5c4a SHA-1: 7f304543826d4e7bccecef509ea5a0598bbe0022 SHA-256: 1702a282871bf813a6a9ee6fdd12d9487ca08d0444692505db2e290e2ee9d87f
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with several identified as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=quantum+glory+pdf+free
    • http://itali-big.space/bitenofukiderikelakuzegypps3.pdf
    • https://cdn.sqhk.co/tijinujul/hUIDgif/gipene.pdf
    • http://organic100.fun/127387715278ju16.pdf
    • https://cdn.sqhk.co/merivexasug/jj3c33a/download_jumia_ewallet_app.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/261898.pdf
    • https://cdn.sqhk.co/najiligopej/mjcibif/puppy_backgrounds_for_your_computer.pdf
    • https://cdn.sqhk.co/lorotukogof/ggEBjh2/18524128025.pdf
    • https://cdn.sqhk.co/bimowikosaru/avxhKRN/phoenix_arizona_news_today.pdf
    • https://cdn.sqhk.co/xejoverol/jbjiO50/wibukibodizasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lerezazo/55043197269.pdf
    • http://lewimidofi.epizy.com/aol_email_application.pdf
    • https://s3.amazonaws.com/bededuxotulapil/the_carpenters_piano_sheet_music.pdf
    • http://dolasuwukino.epizy.com/azotemia_en_perros.pdf
    • https://s3.amazonaws.com/fizufapu/bwv_565_sheet_music_organ.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51b.bin
99cd74745371e760e95c0b03e216ed2ac9890756602a2afa916b946fadf85ff3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5344 bytes
font_01_sfnt_off0000f73f.bin
250938538bd2af0a5f368e6faf733f4db17094adab568661b0579403646bb0e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 13268 bytes