Malicious PDF — malware analysis report

Static analysis result for SHA-256 818b8965c46e4b49…

MALICIOUS

PDF

38.2 KB Created: 2020-03-28 08:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: 5c0d50c0e18e260d6edf4f6ac7b93be5 SHA-1: 19ea8696be61b4836e02e0d1616b64824b0a76ed SHA-256: 818b8965c46e4b4957c30271c6fc21e570499b57affa84ef8dc313c36f3ecd32
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. While no scripts were extracted, the sheer volume of outbound links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://bughunters.eu/uploads/1/3/0/7/130739404/130739404.html#5+ejemplos+de+enunciados+declarativos+afirmativos PDF link annotation
    • http://vhcministry.org/uploads/1/3/0/6/130639851/9920297.pdfIn PDF document text
    • http://playinaustin.com/uploads/1/3/0/3/130379363/jusitokojepefala.pdfIn PDF document text
    • http://silkandsatin.com/uploads/1/3/0/8/130813398/2240139.pdfIn PDF document text
    • http://orlandohobbyshop.com/uploads/1/3/0/4/130476004/5019133.pdfIn PDF document text
    • http://illuminationwellnessnc.com/uploads/1/3/0/2/130288682/puzen.pdfIn PDF document text
    • http://assurantedu.com/uploads/1/3/0/5/130551653/funale.pdfIn PDF document text
    • http://megangingocounseling.com/uploads/1/3/0/5/130588754/f985f1353ac.pdfIn PDF document text
    • http://dv8fashionsllc.net/uploads/1/3/0/7/130775592/gufisezusaluba_vobigovexe.pdfIn PDF document text
    • http://drkmoonradio.com/uploads/1/3/0/5/130541743/5a72f27fcffb.pdfIn PDF document text
    • http://lovacollection.com/uploads/1/3/0/5/130590458/rikurowinumafesawij.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_off00006b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B16 8536 bytes
SHA-256: 7f8cd6a90997549297a09da4043b09876685365841278785bc1b3b091adcfc72

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