Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca814e285866069…

MALICIOUS

PDF

81.6 KB Created: 2020-11-18 05:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 25db4d32ddf74c0750dfa85c71cecb00 SHA-1: 5179e12eaf159b7861b6a870e2606573e0777fc3 SHA-256: aca814e2858660693341bf0b82a31408e0d9d611872bef6b05a99c64c19e89ee
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as pointing to malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature. The presence of embedded links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffine.ru/123?utm_term=wuthering+heights+quotes+about+revenge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_5fb42a10266cd.pdfIn PDF document text
    • https://lejomibis.weebly.com/uploads/1/3/4/6/134657815/pidin_ligosonaduxo_getadojan_bixapofemimo.pdfIn PDF document text
    • https://liwusapewiso.weebly.com/uploads/1/3/4/7/134723342/c347143845fad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5fa25e2985538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fa0e50fd6224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464080/normal_5fab17dcd67ce.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/dinigugaxej/f2s_boiling_point.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/33294357088.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/27585482130.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/xuwatok.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/tipuzirowut.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/deadpool_kills_the_marvel_universe_download.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 5136 bytes
SHA-256: fe9271739e3133372076febaaf4cfa9aa0b66ed873ced043d7e3b7ed298edbee
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 10768 bytes
SHA-256: 99b59d81ba512d6830dae429f6953cc5a2309b603a7f7be4132719fb0615ac18
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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