Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ddb68265897db4…

MALICIOUS

PDF

33.9 KB Created: 2020-05-17 15:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: b3b29de76befd2e786bd6edd72760f2f SHA-1: b4699da29b638695e83c0ea12d401defb9502a60 SHA-256: 53ddb68265897db46d056b8323b97f979ba2e2bdd58ebd0350a647c8ee21d83e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. The document body contains a lure related to 'Amazon Alexa Jeopardy answers today', which is likely a deceptive pretext to encourage users to click the embedded links.

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://ericablaque.com/uploads/1/3/1/4/131454807/131454807.html#amazon+alexa+jeopardy+answers+today PDF link annotation
    • http://fouragile.com/uploads/1/3/0/6/130622104/rejezasupujuzubuzof.pdfIn PDF document text
    • http://niskuprojects.com/uploads/1/3/0/8/130813135/057a784f4.pdfIn PDF document text
    • http://bassanioroofing.com/uploads/1/3/1/1/131164455/6102583.pdfIn PDF document text
    • http://woltra.ee/uploads/1/3/0/6/130620341/2398082.pdfIn PDF document text
    • http://slmediaconsultants.net/uploads/1/3/0/7/130739892/jubuxasukewiwonago.pdfIn PDF document text
    • http://robertodebourg.com/uploads/1/3/1/4/131437106/3206604.pdfIn PDF document text
    • http://jarrettjohnstonamarillodwiattorney.com/uploads/1/3/0/5/130539871/3782698.pdfIn PDF document text
    • http://northfieldtechnologygroup.com/uploads/1/3/1/4/131437074/9f14f13.pdfIn PDF document text
    • http://relocation-change.com/uploads/1/3/0/8/130873912/7258845.pdfIn PDF document text
    • http://militarytravelsales.com/uploads/1/3/0/8/130874102/zusuruwexeli-zaziwewutubexo-gifurizem.pdfIn PDF document text
    • http://southhavenchickhavenfarm.com/uploads/1/3/0/7/130775610/69ecf54599bfc.pdfIn PDF document text
    • http://penin.site/uploads/1/3/0/3/130313803/wifino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

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_off00005656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5656 10696 bytes
SHA-256: 1f58d634134411bce88ad3bcb01d44ad3768d2b5a5b81a68f9661075c5a40fad

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