Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b36d69ed7e53d52…

MALICIOUS

PDF

70.3 KB Created: 2020-11-26 04:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0a670aee54d71bd5d9f3a6e813f05b92 SHA-1: df12e4051ff1fa345e3dc9e545135ecaa809473a SHA-256: 4b36d69ed7e53d52247ae2298b1db0abdeeae7fbfa7730362c2da38fb6a45255
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/strik?utm_term=physical+and+chemical+changes+lab+report+conclusion PDF link annotation
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/2329116.pdfIn PDF document text
    • https://nobokoxevukaj.weebly.com/uploads/1/3/4/7/134755509/1188463.pdfIn PDF document text
    • https://negoladudovas.weebly.com/uploads/1/3/4/4/134456372/padok_vafojurulev_rigesudafumi.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/tonewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_5fa18bff192ff.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/2245757.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/d4ebbe21a18a.pdfIn PDF document text
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/lupipo.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.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/6ba77eb5-b518-49af-a7ca-a426e21f0743/jugawijixopus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58d0dbe-73a4-4a3b-80ae-f88e2bd4e4aa/cyclops_hull_fragments_coordinates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9eeb97-a424-40f7-bab4-9fead8974f01/93760559123.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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 5732 bytes
SHA-256: 7bb3058a1fc2a46c00f72830984a8a1504de1999cc3a41bf831aaeece3b1cdd3
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10708 bytes
SHA-256: 077da0a264ce1ef352f2a4f50281af1c3e410b2d5f816799764218932d63d1f9

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