Malicious PDF — malware analysis report

Static analysis result for SHA-256 19786caba1b64d3a…

MALICIOUS

PDF

76.9 KB Created: 2021-01-18 20:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3dc2441ee74db16c303ab606c1737604 SHA-1: dbab7513762c168771cad3493a53e872fcf5828e SHA-256: 19786caba1b64d3ae8f9aadc5e92835e14c8021b72bbc331d6965293d54bc7dc
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits malicious characteristics, including a high number of embedded links pointing to potentially malicious redirector infrastructure and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to harmful content.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/123?utm_term=brooks+glycerin+13+women%2527s+uk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464319/normal_5fc4bc16a803f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fc7e09a8eb3f.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/595569bf24c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_60052082bf000.pdfIn PDF document text
    • https://juvobivi.weebly.com/uploads/1/3/4/7/134756882/c6e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_5fb5306647273.pdfIn PDF document text
    • http://kitigaw.22web.org/decade_counter_using_ic_7490.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/cfa3666.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/pulujolatepuv/smart_home_lighting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/91332290107.pdfIn PDF document text
    • http://xenikezoteboze.rf.gd/skype_for_business_mac_old_version.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/anime_byousoku_5_centimeter_batch.pdfIn PDF document text
    • http://borinalujid.epizy.com/fazib.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/types_of_inventory_reports_in_tally.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/rusojilutugavololojeriwi.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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5468 bytes
SHA-256: ad8208b3811f09df7dd7b5cc5057f2b73f49a0e0dd0eef9e8cb24493e12793bb
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 11316 bytes
SHA-256: 13476505d862b5bd1dfc4141713e9c0a6e41fdccec67259f79cf189f43a4cc1b

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