Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7862878ef45e670…

MALICIOUS

PDF

69.1 KB Created: 2021-01-28 16:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a66d36de5a48934b95c98de82a67f9f0 SHA-1: 57703f42c35f5e8d9235ccd00c7f886e08387e6c SHA-256: c7862878ef45e670763559d68382c79f2a00995ab0981f0272580cbdbe645a26
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains suspicious and malicious redirector links, with one directly pointing to a known malicious domain. The document's structure suggests it's designed to deceive users into clicking these links, likely to download further malware or lead them to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/123?utm_term=6.7+ford+egr+delete+instructions In PDF document text
    • http://securitycheckingbrowservkcom.xyz/nano_biscotte_v4_manualk0cot.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/tubamedepe.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/c9188ff4b.pdfIn PDF document text
    • http://canlisohbetim.net/royal_family_tree_queen_victoria5nod1.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/b5beeefe465e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5ff8adc5910c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5ff7b625f3c38.pdfIn PDF document text
    • http://zebrait.fun/99566316003vimy0.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
    • http://wepilige.epizy.com/celpip_score_report.pdfIn PDF document text
    • http://wotolag.epizy.com/sozetejubimirevabi.pdfIn PDF document text
    • http://birofasadonu.epizy.com/best_electronic_simulator_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/lego_ninjago_movie_minifigures_feel_guide.pdfIn PDF document text
    • http://vulofuza.epizy.com/tunnelbear_vpn_for_windows_7.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_off0000c1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F3 5032 bytes
SHA-256: 347dc56930a21b1b1f9d31944407ad91d1c36fd24f9a5070f973de3cc26dae40
font_01_sfnt_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 10848 bytes
SHA-256: 108b2719c2dfd30547235893013ac412fbc6a4ac777ed9c0f585545b5f004bec
font_02_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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