Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bde679550bff9b8…

MALICIOUS

PDF

37.5 KB Created: 2020-03-22 06:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5c3f4d89432bba0cba70670c729086a3 SHA-1: 26045a38c9bc4f13cc4bf0d8d3184fd6a460b12a SHA-256: 3bde679550bff9b82077d0c7296d46d7961a80355466719519baf1643927f313
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The document body text, while partially corrupted, suggests a lure related to 'biology exam questions'. The primary attack pattern involves directing users to a network of SEO-optimized PDF landing pages, likely to serve malicious content or advertisements.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://marythumma.com/uploads/1/3/0/3/130323656/130323656.html#preguntas+para+examen+de+biologia+1+secundaria PDF link annotation
    • http://wiseovenbakery.com/uploads/1/3/0/6/130605174/3069844.pdfIn PDF document text
    • http://sosdesentupidora.net/uploads/1/3/0/2/130291552/1017588.pdfIn PDF document text
    • http://whoabroke.net/uploads/1/3/0/3/130379445/d1b6816b80ff1.pdfIn PDF document text
    • http://angiesalterations.com/uploads/1/3/0/6/130604708/povejavimozogo_bekavivumiso.pdfIn PDF document text
    • http://adavisioncorporation.com/uploads/1/3/0/9/130969735/7560173.pdfIn PDF document text
    • http://seetexasfirst.com/uploads/1/3/0/6/130639131/ferubatip.pdfIn PDF document text
    • http://old2.makios.com/uploads/1/3/1/1/131163933/29f9c9894.pdfIn PDF document text
    • http://www.gottaluvthatbling.com/uploads/1/3/0/7/130738578/roliliwu_febuvoze.pdfIn PDF document text
    • http://planetlearning.org/uploads/1/3/0/7/130739830/29df7.pdfIn PDF document text
    • http://adventuresinfirsttimeparenting.com/uploads/1/3/0/3/130323180/7538868.pdfIn PDF document text
    • http://lyndasdesigncenter.com/uploads/1/3/0/3/130323675/0a52e4c0c6c.pdfIn PDF document text
    • http://www.mylindahullmusicaltheatre.com/uploads/1/3/0/8/130814351/jumatavilunujaku.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CC 8860 bytes
SHA-256: 2f3f649fcaa112d5244ad5430fa6a3e14f9682ca53b23225a83a777029583dae

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