Malicious PDF — malware analysis report

Static analysis result for SHA-256 959247ca09f0fc61…

MALICIOUS

PDF

74.7 KB Created: 2020-11-26 01:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0a58fd077d75730aa4ba09f31271d38c SHA-1: bfb696950c569ed2a7a9a3accef14ab60e8b0277 SHA-256: 959247ca09f0fc6168f029b1843290b520cefb1bd0abebdcdc958f2a64575db6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=ff14+thok+ast+thok+extreme In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fa5c5d837d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f9286c2a685c.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/sanemofupa-gimaxevevovu-zesofokot-diwofivipamonel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5f95f58f6f3a9.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/3213027.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/6327393.pdfIn PDF document text
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/5207474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f88998f75d3d.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/mekofiwakomujuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e93ad2-1f82-44f9-a469-c1443b44ccdd/grace_period_for_expired_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760ee337-853a-4e58-9bca-a436932a7080/chromatic_fantasy_jaco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95eeaa5-ac71-433e-b380-2373de6f782f/82657482449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd7df2e-3618-48e2-8fb7-13dd15f2eb9a/3957770464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b56e35a-da0f-40aa-a179-1d7ba28704ba/d2x_cios_wii_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 5204 bytes
SHA-256: c7752a81dbaec03af529f5895354edbc478e1cded78263d7158746fcac22ec42
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10292 bytes
SHA-256: 5d8d6b62ada5e12a5575a3d3f551964889151fef5cb037aaf5f6173ca7c17fcd
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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