Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d6bd8538b050f5…

MALICIOUS

PDF

48.4 KB Created: 2020-11-07 22:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ebe05e49bd908a71a7e4b5243e9bfbea SHA-1: 33bded0384cc3ea2d4d32917422c12973eab0559 SHA-256: 90d6bd8538b050f5f05f13f96308df219042f683818b4d657cc5aca825677123
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body text, though garbled, contains a URL that is also present in the heuristics, indicating a potential phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffnew.ru/123?keyword=2020+phlebotomy+study+guide+pdf PDF link annotation
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/pizuraguro.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/6103116.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/1885911.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/tujoxakogafuxijoduw.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/c22f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f933ab21fa66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5f937815e2dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f962a31a8150.pdfIn PDF document text
    • https://wosefekolejareb.weebly.com/uploads/1/3/4/3/134340916/bb631fdb.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/6e4d857f-9e86-401a-99e7-559bd8e043d0/pixusejobedefemibojejef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9546cf16-9375-4cf6-b7bb-5d60466dfe0e/92239668644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c48dc77-3b7f-4407-b329-4815a52dd149/jixovedelegawisose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c388b6f0-6dd3-46f4-a778-341c0ef7c5ae/sebevidokipikewadulopowox.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_off00007c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 5568 bytes
SHA-256: ea8060b4ee3624856e9273aab4a9c2492203584c974e33e377e9c2ab2e66bf79
font_01_sfnt_off00008f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0C 11044 bytes
SHA-256: f7821c2f202d19771adf78dc64a4bf31ca620585c9c7c0c81b121261d0e2693e

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