Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2eb0c420fc3ba6a…

MALICIOUS

PDF

41.5 KB Created: 2020-06-09 06:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b4eefac63bd662160e615f2c3dcd98e7 SHA-1: ae4088942145020f8ef27ad3978e8362f290f6af SHA-256: e2eb0c420fc3ba6a2039ded3c22beb35b44875a78183fe1c363f69d7f3ce125b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, a technique often used for SEO spam or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body contains garbled text but also includes the URL 'http://wordthings.net/uploads/1/3/0/7/130738911/130738911.html#vitamina+b+la+inyecci%25C3%25B3n+compleja+est' and other PDF links hosted on various domains, suggesting a link farm or redirection scheme. No scripts were extracted from this sample.

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://wordthings.net/uploads/1/3/0/7/130738911/130738911.html#vitamina+b+la+inyecci%25C3%25B3n+compleja+est PDF link annotation
    • http://reduxcustoms.com/uploads/1/3/1/3/131380777/aa1e8e7d.pdfIn PDF document text
    • http://chinhuan.net/uploads/1/3/1/4/131411197/9166303.pdfIn PDF document text
    • http://hostmaster.lightmatter.media/uploads/1/3/1/0/131070398/2920706.pdfIn PDF document text
    • http://maniglowco.com/uploads/1/3/0/5/130538875/mudulegej-jojev.pdfIn PDF document text
    • http://4hg.undesirable.us/uploads/1/3/0/6/130639642/nowibulubuteb.pdfIn PDF document text
    • http://webmail.aptwy.com/uploads/1/3/0/8/130874021/98f629.pdfIn PDF document text
    • http://sailinmykonos.gr/uploads/1/3/1/3/131379029/gerixero-korodup.pdfIn PDF document text
    • http://mta158.qualitynow.net/uploads/1/3/0/4/130483773/9960414.pdfIn PDF document text
    • http://2zm.undesirable.us/uploads/1/3/0/5/130550910/6938965.pdfIn PDF document text
    • http://creativeconcreterentalandsupply.com/uploads/1/3/1/0/131070010/2856792.pdfIn PDF document text
    • http://lorrainecowan.com/uploads/1/3/1/4/131437513/dililusisanu.pdfIn PDF document text
    • http://spotdrives.net/uploads/1/3/0/5/130539295/momebewabi-nimur-fugalox-wigofafanu.pdfIn PDF document text
    • http://mareikura.com/uploads/1/3/0/5/130551343/furagoga_pogupifewupoku_bizelixigev_robiforegofanav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dexoxodar.files.wordpress.com/2020/06/walozowupedodabi.pdfIn PDF document text
    • https://pixudefixig.files.wordpress.com/2020/06/79365535865.pdfIn PDF document text
    • https://gakirebeb.files.wordpress.com/2020/06/66734582251.pdfIn PDF document text
    • https://sunederaxi406707068.files.wordpress.com/2020/06/gelenumosutalaledojiba.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

Related samples 8

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_off00007296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7296 11500 bytes
SHA-256: a7f20d1de0ef952d24ed5e4f7b1c22c65ff9640f7b65ca75cb4b43dbd7faa7fb

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