Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b33f036ae4b00b6…

MALICIOUS

PDF

37.6 KB Created: 2020-05-17 21:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228637b63922aeb461a495d38fe36969 SHA-1: f1011b8a6cbaff8af8d02c4234ee6e1f81cfeab9 SHA-256: 5b33f036ae4b00b61b12b248dc518027170fedb03deaf304a83a96526dddc7cd
136 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to other PDFs hosted on similar-looking domains. This pattern is indicative of a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://online-shop-coles.com/uploads/1/3/1/6/131606951/131606951.html#extendido+de+sangre+periferica+reporte
    • http://zeetadollhouse.com/uploads/1/3/1/3/131381881/bisesam.pdf
    • http://tsiehente.com/uploads/1/3/0/4/130476006/1857968.pdf
    • http://topmarkseducationalconsultancy.com/uploads/1/3/1/8/131871555/6275324.pdf
    • http://qualityclassicjewelry.com/uploads/1/3/0/5/130588937/vafeki.pdf
    • http://vitopescetto.com/uploads/1/3/1/3/131380814/9531826.pdf
    • http://ontariowindowcleaning.com/uploads/1/3/0/6/130620168/d651b9.pdf
    • http://connorpistoleshea.com/uploads/1/3/0/4/130483477/decde883.pdf
    • http://kaaihuebrothers.org/uploads/1/3/1/8/131856141/tubiteburo_gemivevorope_vudexerepitos.pdf
    • http://familywellnessguru.com/uploads/1/3/1/0/131070098/turarujun.pdf
    • http://maryleezawadski.com/uploads/1/3/0/6/130621418/4811302.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006567.bin
7832a651286c2809934d557e20de6cb112989f56f57fb4525e8ebf3bc48a57be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6567 11184 bytes

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